A binary star system is made of stars, two of which is brighter than the other.
Astronomers are able to detect the dimmer star because its gravity causes the bright star to wobble
Astronomers can also spot the dimmer star by observing a phenomenon called a(n) eclipsing binary. This happens when the dim star passes in front of the bright star.
When one astronomical body is obscured by another or when a body moves between it and the observer, this is known as an eclipse.Partial solar eclipses can be seen if you are in the moon's penumbra during a solar eclipse. Solar eclipses happen when the sun is partially blocked by the moon.When the sun, moon, and earth align, the earth covers the moon's view of the sun, causing lunar eclipses.To know more about eclipses visit : https://brainly.com/question/12075389
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What do you notice about the names of the cations and anions on the cards. How do they compare with the name of the neutral atom or element? Do the non-metals have anything in common about their name?
Based on the successive ionization energies for the following element "X", predict the formula that would be formed when "X" reacts with chlorine, Cl.
Based on the successive ionization energies, the formula that would be formed when "X" reacts with chlorine, Cl is XCl.
Since it is seen that there is a large gap in energy difference in second ionization energies ( from 577 to 1820), which means that the valance electron in the given element X is 1. So, the formula will be X⁺ and Cl⁻ is XCl.
Successive ionization strength is described because of the energy this is required to cast off the electron one after the alternative. Successive ionization power will rely on the range of electrons gift in the outermost shell.
Successive ionization energies boom in value due to the fact the variety of electrons, which purpose repulsion, progressively lower. This isn't always a smooth curve there may be a large leap in ionization power after the atom has misplaced its valence electrons.
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A buffer is prepared which contains 0. 10 m nitrous acid, hno2, and 0. 12 m sodium nitrite, nano2. (ka=4. 5x10-4) calculate the ph after 0. 019 mol of naoh is added to 1. 00 l of the buffer
The pH value of the given buffer system after the addition of 0.019 mol of NaOH is 3.58.
To determine the pH of a buffer system, we use the Henderson-Hasselbalch equation:
[tex]pH = pK_{a} + log\frac{[base]}{[acid]}[/tex]
In our case, the base is sodium nitrite, while the acid is nitrous acid. Upon addition of NaOH, the added base will react with the acid, neutralizing it and turning it into sodium nitrite. We need to calculate how much acid and base we will have after the addition of NaOH:
[tex]n_{NaNO_{2} } = 1 L * 0.12 M + 0.019 mol = 0.139 mol[/tex]
[tex]n_{HNO_{2} } = 1 L * 0.10 M - 0.019 mol = 0.081 mol[/tex]
Because the volume of the solution is the same for both components, we don't need to calculate the actual concentrations and can just plug in the moles in the Henderson-Hasselbalch equation:
[tex]pH = -log(4.5 x 10^{-4}) + log\frac{0.139 mol}{0.081 mol} = 3.35 + log1.716 = 3.58[/tex]
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A niche is_____________?
Answer:
The term niche, when used in the science of ecological biology, is used to define an organism's role in an ecosystem. Not only does its niche include the environment that a given organism lives in, but it also includes the organism's "job" in that environment.
Answer:
a niche is an area within an ecosystem in which a particular group of organisms live in.
Write a 600-word report discussing nuclear reactors. The report should include a description of the way a reactor works and the theory behind nuclear reactions. Be sure to answer these questions: What are breeder reactors? How are they different from regular nuclear reactors? What are their advantages and disadvantages?
Write your report in the essay box below.
PLEASESSSSS THE DUE DATE IS TOMORROW
Nuclear reactors are the main components of the nuclear power plants which are used for the production of heat through the process called fission.
What are breeder reactors?The nuclear reactors are divided into many types which include:
Pressurized water reactor,Boiling water reactor,Pressurized heavy water reactor, Light water graphite reactor and Breeder reactors.The Breeder reactors are the type of reactors that has the ability to yield more energy than it can consume which makes it economical.
The Breeder reactors are different from the regular nuclear reactors because it utilizes either uranium-238 or thorium, while regular nuclear reactors makes use of isotope uranium-235.
An advantage of Breeder reactors is that they produce more fuel that it consumes while it's disadvantage is that it's more dangerous than a regular reactor.
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What additional information, if any, would enable you to calculate the molality of a 7. 35 molar solution of a nonelectrolyte solid dissolved in water?.
The additional information needed to calculate the molality of a 7.35 molar solution of a non-electrolyte solid dissolved in water is the density of that solid.
To calculate the molality(m) from the molarity(M) of a solution, the following formula is used
m = 1000M/M x MM- 1000d
Here MM is the molar mass of solute
And d is the density of the solute
As the other information like molarity and molar mass of the solute is already given to us, the additional information needed is density.
Thus, the additional information needed to calculate the molality of a 7.35 molar solution of a non-electrolyte solid dissolved in water is the density of that solid.
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what is the investigation if the independent variable is altitude of water and the dependent variable is boiling temperature
If the independent variable is altitude of water and the dependent variable is boiling temperature. The experiment could be on how high does the water bubble and jump when boiling.
Consider strategies to adjust each variable individually once you believe you have identified those that may be at play. If you alter more than one at once, you won't be able to identify the variable that is responsible for your observation. There are instances when factors are connected and act in concert to generate an event. Try to pick variables at beginning that you believe behave independently of one another.
The altitude of water is the independent variable, sometimes referred to as the manipulated variable.
The boiling point of water is the dependent variable (sometimes referred to as the responsive variable).
Therefore, if the independent variable is altitude of water and the dependent variable is boiling temperature. The experiment could be on how high does the water bubble and jump when boiling.
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Iodine and tellurium were swapped by Mendeleev in the Periodic Table so that they were not in order of atomic weight. State the type of atom that gives an explanation as to why order based on atomic mass is not always correct.
The example of Iodine and tellurium where iodine which had lesser atomic mass was placed before tellurium proved that order of the Periodic table based on atomic mass was not always correct.
Why did Mendeleev swap Iodine and tellurium in his Periodic Table so that they were not in order of atomic weight?The periodic table as designed by Mendeleev was arranged such that the elements were arranged in order of increasing atomic mass.
However, in this case of tellurium and iodine, Mendeleev placed tellurium before iodine even though it had a greater atomic mass than iodine. This was because Mendeleev observed that elements with similar chemical properties were occurring in a regular pattern in the periodic table and iodine has similar chemical properties to bromine and chlorine before it.
Therefore, the case of Iodine and tellurium proved that arranging elements in the periodic table in order of increasing atomic mass was not always correct.
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Answer:
literally all you have to write to get the mark is the word isotopes
Stste with reason the meathod of collection of hcl gas in laboratory
Answer:
HCl gas is collected by upward displacement of air because it is 1.28 times heavier than air. It is not collected in water because it is highly soluble in water.
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Explanation:
Which statement best describes a scatterplot?
A. it shows data as a percentage of a whole
B. it shows data points connected by a single line
C. it shows quantitative data that relate two variables
D. it shows qualitative data grouped by similarities
Identify the type of solid for ice. networking atomic solid molecular solid nonbonding atomic solid ionic solid metallic atomic solid
Molecular Solid can be described as the solid type for ice where the molecules are held together with low intermolecular force to form such kind of solids.
What qualifies as a molecular solid?Van der Waals forces hold molecules together to form molecular solids. These intermolecular forces are weak, which controls its characteristics. Molecular solids are electrical insulators, soft, frequently volatile, and have low melting temperatures.
What sort of molecular solid is that?Molecular solids are composed of atoms or molecules bound together by hydrogen bonds, London dispersion forces, or dipole-dipole forces. Characterized by weak conductivity, flexibility, and low melting points. Sucrose is a type of molecular solid.
What exactly does molecular solid mean?A solid made up of distinct molecules is referred to as a molecular solid. Molecular solids can be either soft or rigid.
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Complete Question
Identify the type of solid for ice.
A) Nonbonding atomic solid
B) Metallic atomic solid
C) Molecular solid
D) Ionic solid networking atomic solid
A specific nitrogen atom has 7 protons and 6 neutrons if this is neutral atom how many electrons does the atom have
Nitrogen atom have 7 electrons.
Is it possible for nitrogen to have seven electrons?Nitrogen is the seventh element, with seven electrons. The first two electrons in the electron configuration for nitrogen will be in the 1s orbital. Because the 1s orbital can only hold two electrons, the next two electrons for N are placed in the 2s orbital.When one shell is full, the next electron must move to the next shell. So you already know that the atomic number of NITROGEN tells you the number of electrons. That means a nitrogen atom has 7 electrons.The number of protons in a neutral atom equals the number of electrons. The atom's mass number (M) equals the sum of the number of protons and neutrons in the nucleus. The number of neutrons equals the difference between the atomic mass number (M) and the atomic number (Z).Protons are subatomic particles that have a positive charge. The strong nuclear force holds protons together in the nucleus of an atom. Neutrons are non-charged subatomic particles (they are neutral).
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Which of the following are objects in motion?
rose bush
puddle of water
both rose bush and puddle of water
neither rose bush or puddle of water
At the end of the experiment you will be assessing the purity of your aspirin by measuring its absorbance at 525 nm. If the absorbance measurement is found to be 0. 040 then what is the % salicylic acid impurity in your aspirin?.
At the end of the experiment you will be assessing the purity of your aspirin by measuring its absorbance at 525 nm. If the absorbance measurement is found to be 0. 040 then the % salicylic acid impurity in your aspirin will be 7.8 percent.
According to the inquiry, the sample solution's absorbance (A) is 1.07. Beer's law, which states that A = ebc, is used to calculate the aspirin concentration.
Here, b is the route length, which is equal to 1 cm, and e is the extinction coefficient, which is equal to 139.322 M-1cm-1 based on the salicylic acid standard value. Having established our ideals,
A = ebc
c = A / (eb)
c = 1.07 / (139.322 × 1)
c = 0.00768 M
To establish the percentage of salicylic acid in the sample, it is now necessary to compare the value of concentration calculated with the concentration of aspirin previously administered.
The question mentions that the starting concentration of aspirin is 0.02 grammes. The molar mass of aspirin is 240 g/mol.
The aspirin molecules will therefore be,
0.02 / 240 = 8.33 × 10^-5 moles
The final volume of the diluted solution given is 10 ml or 0.01 liters.
The molarity of aspirin in the diluted solution will be,
c1 = 8.33 × 10^-5 / 0.01 = 8.33 × 10^-3 M or 0.00833 M
Now, the percent of salicylic acid in the product will be,
c1 - c / c1 × 100
(0.00833 - 0.00768) / 0.00833 × 100 = 7.8 %
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a box has two forces acting on it. one force is 100 n upward. another force is 50ndownward. what is the net force on the box?
The net force on the box would be 50 N in the upward direction.
What is a net force?The net force acting on an object is the resultant force acting on the object.
The net force acting on an object is the sum total of all the forces acting on the object. This is when the direction of the forces is put into consideration.
In the present problem, two forces are acting on the object. These two forces are antagonistic. One force is in the upward direction while the other is in the downward direction.
The resultant force can be calculated as:
100 N - 50 N = 50 N
Now, this resultant force is in the upward direction.
In other words, the net force on the object is 50 N in the upward direction.
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Imagine that you are standing at the center of a giant bowl of gelatin. What type of wave will you make across the top of the gelatin if you jump up and down? Explain your answer.
Transverse waves will be made across the top of the gelatin if you jump up and down.
Transverse waves are waves that oscillate along routes that are perpendicular to the direction in which the wave is moving forward. Examples of transverse waves include electromagnetic waves, seismic S waves, and water surface ripples. Particles in a transverse wave oscillate up and down about their mean location rather than following the wave's path of transmission.
A transverse wave is one in which each particle of the medium moves around its mean location in a direction that is the opposite of the direction in which the wave is propagating. Transverse waves are what makeup light. Only solids and the surface of liquids may generate transverse waves. They are unable to be created inside liquids or gases.
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the solubility of glucose at 30°c is 125 g/100 g water. a solution is made by adding 250 g of glucose to 100 ml of water at 30°c. remember that 1 g water
The solubility of glucose is classified as a Supersaturated solution that is made by adding glucose to water at varying amounts for various compounds.
What do you mean by solubility?The maximum amount of the chemical that will get to dissolve in a given amount of solvent at a given temperature is referred to as the solubility of that solution. Varying compounds have very different solubilities, which is a characteristic of a particular solute-solvent pair.
What does solubility mean in a nutshell?The creation of a new bond that is between the molecules of the solute and the solvent is known as the solubility. Solubility means the greatest amount of solute that can be dissolved in a known amount of solvent at a specific temperature.
Why is solubility in water important?The quantity of a chemical that can dissolve in water at a particular temperature is known as its water solubility. It is customary to measure solubility in mg/L (milligrams per liter) or ppm (parts per million).
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Complete Question
The solubility of glucose at 30°c is 125 g/100 g water. A solution is made by adding 250 g of glucose to 100 ml of water at 30°c. Remember that 1 g water = 1 ml water. How would you classify this type of solution?
A) heterogeneous
B) saturated
C) supersaturated
d) unsaturated.
The wavelength of blue light is 0.00000045 m. express this wavelength in scientific notation.
The wavelength of blue light is 0.00000045 m. This wavelength in scientific notation is 4.5 × 10⁻⁷m.
What is wavelength ?
A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places adjacent crests in the consecutive cycles.
A spectrum is the term used to describe the range of wavelengths or frequencies for wave phenomena. The term was originally used to describe the electromagnetic spectrum, but it is now used to describe the sound spectrum and vibration spectrum.
The wavelength, which will also apply to troughs, is the separation between two wave crests. The frequency is measured in cycles per second and represents the number of vibrations that pass over a certain area in one second (Hz).
Thus, This wavelength in scientific notation is 4.5 × 10⁻⁷m.
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The km of an enzyme is 5. 0 mm. Calculate the substrate concentration when this enzyme operates at one‑quarter of its maximum rate.
The substrate concentration of the enzyme operating at one‑quarter of its maximum rate is = 0.333.
Relationship between Km and substrate concentration is -
Km is the concentration of substrate.It allows the enzyme to achieve half Vmax. High Km enzyme requires a higher concentration of substrate to get Vmax. Since, Km is a constant. If the substrate concentration is increased, it has no effect on it.
An enzyme with a high Km has a low affinity for its substrate. The substrate concentration Km corresponds to the substrate concentration.
The substrate concentration at which the reaction rate of the enzyme-catalyzed reaction is half of the maximum reaction rate Vmax.
The equation is:
V₀ = Vmax [S]
[S] + Km
Here,
V₀ is initial rate,
Km is the dissociation constant between the substrate and the enzyme,
Vmax is the maximum rate, and
S is the concentration of substrate.
taking fraction of V₀ and Vmax :
V₀ = [S]
Vmax [S] + Km
V₀ = 0.5Km = 0.333
Vmax 1.50 + Km
Therefore, the substrate concentration of this enzyme operating at one‑quarter of its maximum rate is = 0.333.
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Based on the solubility observations, which of the following pairs of cations could be differentiated by the addition of sodium chloride to the solutions?
The pairs of cations could be differentiated by the addition of sodium chloride to the solutions are barium and lead.
Which solution can be distinguished?We know that an ionic solution is composed of ions. The ions in a solution are capable of interacting with reagents and this is the basis for the qualitative identification of ions in a solutions.
Now let us look at the options, we are going to look out for the option in which the addition of the chloride ion would lead to the emergence of a precipitate in the solution.
If we consider the solutions properly, we would see that the pairs of cations could be differentiated by the addition of sodium chloride to the solutions are barium and lead.
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Missing parts;
Based on the solubility observations, which of the following pairs of cations could be distinguished by the addition of sodium chloride to the solutions?
Choose..
barium and lead
barium and aluminum
lead and silver
iron and calcium.
how do you think car pooling help reduce air pollution
Answer:
Carpooling with just one other person means that there is one fewer vehicle on the roads. That vehicle won't be emitting greenhouse gases during that commute.
Explanation:
why you think your claim is the best explanation for Jordan Jones’s improved performance.
Referring below mentioned assertions,
Claim 1: Jordan Jones used blood doping to accelerate his cellular respiration and boost his performance.
Claim 2: By altering his pre-race diet, Jordan Jones boosted his cellular respiration and overall performance.
Claim 3: By practicing at a greater altitude, Jordan Jones raised his cellular respiration and enhanced his performance.
The assertion that Jordan Jones trained at a greater altitude improved his performance and boosted cellular respiration is the strongest.Cycling is a widely popular sport, particularly in the US. There are now numerous cycling federations that organize competitions all over the world, making the sport more well-known.People who take part in athletic competitions frequently train at high altitudes.Therefore, the strongest claim is that Jordan Jones trained at a greater altitude, which enhanced his cellular respiration and improved his performance.
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Does a size separation technique make sense for separation of one soluble and one insoluble salt?.
NO, a size separation technique does not make sense for separation of one soluble and one insoluble salt.
To separate one soluble and insoluble salt, techniques of solvent extraction and evaporation, crystallization are used. Among these, evaporation is the best technique to separate the salts.
Size separation techniques sieving, sifting, and screening. These are used on the basis of differences in size, shape, and density between particles.
The technique of evaporation is used. The mixture of the two soluble and insoluble salts are added to water. The soluble salt is allowed to dissolve and the insoluble salt is filtered out. The soluble salt can be obtained by evaporating with water.
This method involves four stages :
TitrationEvaporationCrystallizationRecrystallizationTo learn more about separation techniques,
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At the end of the experiment you will be assessing the purity of your aspirin by measuring its absorbance at 525 nm. If the absorbance measurement is found to be 0. 040 then what is the % salicylic acid impurity in your aspirin?.
At the end of the experiment you will be assessing the purity of your aspirin by measuring its absorbance at 525 nm. If the absorbance measurement is found to be 0. 040 then the % salicylic acid impurity in your aspirin will be 7.8 percent.
The sample solution's absorbance (A), as specified in the question, is 1.07. Beer's law is applied to determine the aspirin concentration, which is A = ebc.
Here, e is the extinction coefficient, which, according to the standard value for salicylic acid, is equal to 139.322 M-1cm-1, and b is the path length, which is equal to 1 cm. Now that we have our values,
A = ebc
c = A / (eb)
c = 1.07 / (139.322 × 1)
c = 0.00768 M
It is now necessary to compare the value of concentration determined with the concentration of aspirin previously given in order to calculate the percent salicylic acid in the sample.
Aspirin's initial concentration, which is specified in the query, is 0.02 grammes. Aspirin has a molar mass of 240 g/mol.
Consequently, the aspirin molecules will be,
0.02 / 240 = 8.33 × 10^-5 moles
The final volume of the diluted solution given is 10 ml or 0.01 liters.
The molarity of aspirin in the diluted solution will be,
c1 = 8.33 × 10^-5 / 0.01 = 8.33 × 10^-3 M or 0.00833 M
Now, the percent of salicylic acid in the product will be,
c1 - c / c1 × 100
(0.00833 - 0.00768) / 0.00833 × 100 = 7.8 %
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the density of benzene at 15 °c is 0.8787 g/ml. calculate the mass of 0.1500 l of benzene at this temperature. enter your answer in terms of grams, but do not include units in the blank.
At 15 °C, benzene has a density of 0.8787 g/ml. 131.8g make up 0.15 L of benzene's mass.
What is density?Density, mass of a unit volume of the material substance. The formula for density is d = M/V, where d is the density, M is mass, and V is volume. Density is commonly expressed in the units of grams per cubic centimeter. For example, the density of water is 1 gram per cubic centimeter, and the Earth’s density is 5.51 grams per cubic centimeter.
Density can also be expressed as the kilograms per cubic meter (in meter-kilogram-second or SI units). For example, the density of the air is 1.2 kilograms per cubic meter. The densities of common solids, liquids, and gases are listed in the textbooks and handbooks.
Density offers a convenient means of obtaining mass of a body from its volume or vice versa; the mass is equal to the volume multiplied by the density (M = V*d), while the volume is equal to the mass divided by the density (V = M/d). The weight of a body, which is usually of more practical interest than its mass, can be obtained by multiplying mass by the acceleration due to gravity.
There is a relationship between a substance's mass (m), volume (V), and density (d) that reads as follows:
d = m / V.
d = 0.8787 g/ml.
V = 0.15 x 1000 = 150 ml.
∴ the mass of 0.15 L of the benzene = d x V = (0.8787 g/ml) (150 ml) = 131.8 g.
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how does water's polarity help it to dissolve so many substances? (3 points) water's polarity allows it to form covalent bonds with many different substances. water's polarity increases its ability to form ionic bonds with ions and hydrocarbons. water's oppositely-charged ends are attracted to charged ions and polar molecules. water's oppositely-charged ends are able to interact with and dissolve hydrophobic substances.
Water's polarity help it to dissolve so many substances as water's oppositely charged ends are attracted to other charged ions and polar molecules.
water's polarity allows it to form covalent bonds with many substances because of water bent shape. it gives oxygen atom partial negative charge and hydrogen atom partial negative charge .the positive part attract and pull of negative part solute and the negative part attract and pull of positive part of solute.
Hydrocarbons are non polar molecule , they do not dissolve in polar solvent like water. so, water's polarity does not increases its ability to form ionic bond with ions and hydrocarbons.
Hydrophobic means water - fearing . this means the hydrophobic substances donot dissolve in water.
Thus, Water's polarity help it to dissolve so many substances as water's oppositely charged ends are attracted to other charged ions and polar molecules. hydrocarbons and hydrophobic substance do not dissolved in water.
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Answer quick cause its time
How do gamma rays differ from alpha particles and beta particles?
a)How do gamma rays differ from alpha particles and beta particles?
b)Gamma rays and alpha particles result in the formation of new atoms, but beta particles do not.
c)Alpha particle and beta particle emissions result in the formation of new atoms, whereas gamma ray emissions do not.
d)Gamma rays have mass, whereas alpha and beta particles do not.
Answer:
While alpha and beta rays have energy and mass, gamma rays are pure energy.
How do you know what's in a mixture?
Answer:
combining two or more substances, such that each maintains its chemical identity. In other
Density is
Group of answer choices
How much mass something has for its size
The force of gravity on an object
How much matter something has
How much space something takes up
Answer:
How much matter something has
Density is how much matter something has.
What is Density ?The amount per unit of length, area, or volume: as. a: a substance's mass per unit volume. the distribution of a quantity per unit, typically of space, such as mass, power, or energy.
A substance's density is defined as its mass per unit of volume. Density is most frequently represented by the symbol, however Latin letter D may also be used. Mass divided by volume is the formula for density in mathematics: display style rho = frac mV. where m is the mass, V is the volume, and is the density.
The ratio of an object's mass to its volume is its density.
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iron‑59 is used to study iron metabolism in the spleen. its half‑life is 44 days. how many days would it take a 28.0 g sample of iron‑59 to decay to 1.75 g?
A 28.0 g sample of iron‑59 to decay to 1.75 g would take 176 days if its half-life is 44 days.
How to find the number of days it would take to decay?From the first order kinetics, We know that
t= 2.303 × log A₀[tex]A_{t}[/tex] .... (1)
Here, t is the number of days it would take for the sample to decay.
K refers to the first-order rate constant,
A₀ refers to the concentration at time = 0
[tex]A_{t}[/tex] is the concentration at time t.
Given that,
Half-life of the iron-59, [tex]t_{\frac{1}{2}}[/tex] = 44 days
A₀ = 28 g
[tex]A_{t}[/tex] = 1.75 g
t =?
K =?
In order to find the rate constant use the formula
[tex]t_{\frac{1}{2}}[/tex] = 0.693/K
K = 0.693 / [tex]t_{\frac{1}{2}}[/tex]
= 0.693/44
= 0.01575 per day
Substitute all the values in (1), to get,
t = (2.303/0.01575)×log(28/1.75)
= 176.06 days
Therefore, for a 28.0 g sample of iron‑59 to decay to 1.75 g, would take 176 days.
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