This question will walk you through the process of calculating the
number of molecules present in a sample of a compound with a given
mass and chemical formula. This problem will be solved via the
following sequence of conversions: mass → moles → molecules
Consider a dose of Pepto Bismol containing 525 mg of its active
ingredient, bismuth subsalicylate (C7HsBIO4).
Step 2a: Design a problem-solving strategy. Convert the mass given in
milligrams to grams. The molecular formula of bismuth subsalicylate is
C7HsBIO4. What is the molar mass of this compound?

The number of excess electrons contained within the drop of Millikan oil drop experiment is determined as 7 excess electrons.

The excess electrons contained within the drop of Millikan oil drop experiment is calculated as follows;

-1.60 x 10⁻¹⁹ C = 1 electron

-1.12×10⁻¹⁸ C = ? electrons

= ( -1.12×10⁻¹⁸ C) / (-1.60 x 10⁻¹⁹ C )

= 7 excess electrons

Thus, the number of excess electrons contained within the drop of Millikan oil drop experiment is determined as 7 excess electrons.

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Answer:

The wax vapor starts to burn and creates the stable candle flame that you see. When you blew out the candle you should have seen white smoke rising up into the air from the wick. This is the wax vapor, which becomes visible as it condenses into small liquid droplets in the cooler air.

Explanation:

hope it helps

Answer:

This would be my answer and I hope this helps you.

observe that the flame is not touching the solid candle or the melted wax. It appears to be only touching the wick. I ask them if they think that the candle would burn as long if it were only the wick that was burning. What is the purpose of the wax? When the students place the first flame into the smoke of the second candle, they should see the second candle relight. It is not necessary to touch the wick in order for it to relight. This should lead them to conclude that it is the wax vapor that is burning.

When the students place the beaker containing the ice water above the candle, they should see condensation on the bottom of the beaker. If they hold it too close, they will not see the condensation and will see soot form. Students will usually recognize that the condensation is made of water, but they have difficulty recognizing that it comes from the combustion of the candle.

When the Erlenmeyer flask is placed over the top of the candle in the water, student should observe that the water candle goes out and the water rises. The students test the gas that was collected with phenol red solution (an acid-base indicator). They should observe that the solution changes from red to yellow. I demonstrate that this might indicate the formation of carbon dioxide by blowing through a straw into a solution of phenol red.

Explanation:

Hope this helped you!And thanks for inviting me to be your friend!(:

The effect of using plant food(Miracle grow) is providing nutrients for plants, increasing longevity, and fostering plant growth.

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Answer: 9.946*10^-2 M

Explanation: if u multply

If the change in enthalpy is positive then reaction must be endothermic, it means all absorb energy while reaction proceed.

Given,

H2S(g) + 2 O2(g) → H2SO4 (l)                      ΔH = –235.5 kJ       Equation (1)

H2S(g) + 2 O2(g) → SO3(g) + H2O(l)          ΔH = –207 kJ          Equation (2)

H2O(l) → H2O(g)                                         ΔH = 44 kJ              Equation (3)

From above given reaction,

Reverse the equation (1) reaction

H2SO4 (l) → H2S(g) + 2 O2 (g)          ΔH = 235.5 kJ            Equation (4)

Adding all equations (2), (3), and (4):

To get overall reaction is:

H2SO4 (l) → SO3 (g) + H2O (g)

Overall ΔH value is:

ΔH = 235.5 kJ - 207 kJ + 44 kJ

ΔH = 72.5 kJ

Overall change in enthalpy is +72.5 kJ.

The reaction is thermodynamically favored

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The vapor pressure is obtained as 3.7 atm.

The Clausius-Clapeyron equation is the equation that we could use to obtain the vapor pressure of a solution at any temperature. Of course we would always have two different temperatures to work with.

Hence;

ln(P1/P2) = ΔHvap/R (1/T2 - 1/T1)

P1 = initial pressure

P2 = final pressure

ΔHvap =  enthalpy of vaporization

T2 = final temperature

T1 = initial temperature

ln(1/P2) = 35.2 * 10^3/8.314 (1/338 - 1/307)

ln(1/P2) = 4234(0.00295 - 0.00326)

ln(1/P2) = -1.31

1/P2 = e^-1.31

P2 = 1/e^-1.31

P2 = 3.7 atm

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Answer:

i think paint

Explanation:

The average atomic mass of the two isotopes  is 7346.717 atomic mass units.

Average atomic mass  of an element  is the sum of masses of it's isotopes multiplied by it's natural abundance. The percent of natural abundance of isotope is converted in to decimal form by dividing it by hundred.

It is a fraction representing natural abundance of the isotope .It is found out because there is no mass set for an element.

To calculate average atomic mass, the given data is substituted in the formula,

average atomic mass=abundance×atomic mass of isotope 1 +abundance×atomic mass of isotope 2

=(0.158×71.68)+(99.842×73.47)

=11.3254+7335.39

=7346.71 atomic mass units

Thus, the average atomic mass is 7346.71 atomic mass units.

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The kind of chemical reaction that results in the formation of sodium chloride is a neutralization reaction.

Bases react to produce water and salt, which requires the interaction of H+ and OH- ions. A pH of 7 results from the neutralization of a potent acid and a potent base. A strong base neutralizing a weak acid will provide a pH result that is more than 7, while the neutralization of a strong acid and weak base will produce a pH result that is less than 7.

A solution is neutralized when equal amounts of acid and base combine to create salts. One mole of protons (H+) is equivalent to one mole of the base, and one mole of acid is equivalent to one mole of protons (H+) (OH-). N parts of acid will always neutralize N parts of the base because salts are created by neutralization reactions with comparable weight concentrations of acids and bases.

Therefore, the kind of chemical reaction that results in the formation of sodium chloride is a neutralization reaction.

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Ionic bonding continued. In the reaction between lithium and oxygen, lithium donates its valence electrons to oxygen atoms.

Li ( Z=3 ) , E.C. 2,1

Lithium will lose one electron to form unipositive ions.

O ( Z=8 ), E. C. 2, 6

Oxygen will gain 2 electrons to form a negative ion

So the formula of Lithium oxide will be Li2O

Hence the number of oxide ions will be half the number of Lithium ions or 1.07 × 10^22 / 2 Or 0.585 × 10^22 ions.

As you can see in the animation to the right, two lithium atoms react with one of her oxygen atoms. Each lithium atom donates an electron to an oxygen atom. In ionic compounds, the total number of cation charges must equal the total number of anion charges. In other words, the connection must be neutral. This is an example of a binary ionic compound consisting of two elements, a cation, and an anion. Lithium, a metal, has a positive charge, and fluoride, a non-metal, has a negative charge, so these two ions are held together by an ionic bond.

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The difference in electronegativity of the two elements is less than 1.7 represents the covalent bond.

If the electronegative difference is greater than 1.7, the bond's nature is ionic; if it is less than 1.7, the bond's nature is covalent.

The sharing of electrons between atoms is known as covalent bonding. This kind of bonding happens when two atoms of the same or closely related elements in the periodic table come together.

Covalent bonding is seen in  between nonmetals and metals, this bonding typically happens between nonmetals. Covalent bonds are most likely to form when two atoms have comparable electronegativities, or the same affinity for electrons.

Therefore, The difference in electronegativity of the two elements is less than 1.7 represents the covalent bond.

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The forward reaction in the tetra-chloro cobalt(II) ion and hexa-aquo cobalt ion equilibrium is a exothermic process.

The reaction is exothermic in the forward reaction because Co(H₂O)₆[tex]^+2[/tex]  is more stable than CoCl₄[tex]^2-[/tex] as the bond are stronger in aquo complex of cobalt than in chlorate complex.

It is expected that if temperature is increased, reaction will occur in reverse direction to favoring endothermic reaction ,and if temperature is decreased exothermic reaction is favored.

In exothermic reaction,the color of complex is pink due to an increase in the number of water molecules while in endothermic reaction there is an increase in the concentration of chloride ions which leads to blue color solution.

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[tex]\implies[/tex] The correct answer is (B) 0.00037

[tex]\bf{ \underline{Step \: 1)} :3.7 × 10^{-4 }we \: can \: write \: as \:37 × 10^{-5}}[/tex]

[tex]\bf{ \underline{Step \: 2)} :37 × 10^{-5 } \: we \: can \: write \: as \: 37 × \frac{1}{10^5}}[/tex]

[tex]\bf{ \underline{Step \: 3)} :37 × \frac{1}{10^5}\: we \: can \: write \: as \: (37 × \frac{1}{(10)(10)(10)(10)(10)}})[/tex]

[tex]\bf{ \underline{Step \: 4)} :37 × \frac{1}{(10)(10)(10)(10)(10)} we \: can \: write \: as \: ( 37 × \frac{1}{100000}})[/tex]

[tex]\bf{ \underline{Step \: 5)} :37 × \frac{1}{100000} \: we \: can \: write \: as \: \frac{37}{100000}}[/tex]

[tex]\bf{ \underline{Step \: 6)} :\frac{37}{100000} \: we \: can \: write \: as \: 0.000037}[/tex]

The quantity  in moles of sodium atoms is 0.631 moles of sodium if you have 3.80 × 10²³ moles  of sodium.

Moles is defined as a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules and some other specified particles.

It is a very important unit of measurement which chemist use. It can also be defined as the amount of substance that contain exactly 6.022 x 10²³ elementary entities in a given substances.

1 moles = 6.022 x 10²³ atoms

3.80 × 10²³ atoms of sodium will have

3.80 × 10²³  x 1 mole of Na /  6.022 x 10²³ atoms

= 0.631  moles of Na

Thus, quantity  in moles of sodium atoms is 0.631 moles of sodium if you have 3.80 × 10²³ moles  of sodium.

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The density of the solid block is 3.79 * 10⁻³ g/cm³.

The density of a substance is defined as the ratio of mass and volume of a substance.

Density measure how close together the particles of a given mass of a substance is. Substances with high density have greater masses compared to the volume of those substances whereas substances with low densities have greater volume compared to their masses.

The volume of the solid block = 78 * 55 * 35 = 150150 cm³

mass of solid block = 569 g

Density of the solid block = 569 g/150150 cm³

Density of the solid block = 3.79 * 10⁻³ g/cm³

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The type of graph that will be to display the data collected by the store keeper is bar graph.

A bar graph can be defined as a chart or a graphical representation of data, quantities or numbers using bars or strips.

Also, a bar graph is a graph that shows complete data with rectangular bars and the heights of bars are proportional to the values that they represent.

Three bar graphs can be used to display the data collected by the store keeper.

Thus, the type of graph that will be to display the data collected by the store keeper is bar graph.

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Answer:

the answer is maybe 0.000777

The mass of ammonia gas produced by the given volume of hydrogen and nitrogen is 5.066 g.

The mass of ammonia in grams would be produced at temperature 288 K and a pressure of 0.87 bar is determined using the ideal gas equation.

The ideal gas equation is as follows;

PV = nRT

where;

P is pressure

V is volume

n is number of moles

R is molar gas constant = 8.314 × 10⁻² L.bar.K⁻¹.mol⁻¹

T is temperature in kelvin.

number = mass/molar mass

Considering the data provided, the moles of each gas present in their containers are as follows;

n = PV/RT

moles of nitrogen gas:

P = 0.87 bar,  V = 11.67, R = 8.314 × 10⁻² L.bar.K⁻¹.mol⁻¹, T = 288 K

n = 0.87 * 11.67/8.314 × 10⁻² * 288

n = 0.424 moles

moles of hydrogen gas:

P = 0.87 bar,  V = 12.3, R = 8.314 × 10⁻² L.bar.K⁻¹.mol⁻¹, T = 288 K

n = 0.87 * 12.3/8.314 × 10⁻² * 288

n = 0.447 moles

The equation of the reaction is given below:

N₂ (g) + 3 H₂(g) → 2 NH₃ (g)

From the equation, mole ratio of nitrogen to hydrogen is 1 : 3, therefore, hydrogen is the limiting reactant.

Moles of ammonia gas produced = 0.447 * 2/3 moles

Moles of ammonia gas produced = 0.298 moles

molar mass of ammonia gas = 17.0 g/mol

Mass of ammonia gas produced = 0.298 moles * 17.0 g/mol

Mass of ammonia gas produced = 5.066 g

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For an endothermic reaction, ΔH is positive (>0).

For an exothermic reaction, ΔH is negative (<0).

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The mass, in grams, of 932 atoms of cesium, Cs is 2.06×10⁻¹⁹ grams

6.02×10²³ atoms = 1 mole of cesium

But

1 mole cesium = 132.91 g

Thus, we can say that:

6.02×10²³ atoms = 132.91 g of cesium

The mass of cesium that contains 932 atoms can be obtained as illustrated below:

6.02×10²³ atoms = 132.91 g of cesium

Therefore,

932 atoms = (932 atoms × 132.91 g) / 6.02×10²³ atoms

932 atoms = 2.06×10⁻¹⁹ g of cesium

Thus, the mass of cesium that contains 932 atoms is 2.06×10⁻¹⁹ grams

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A scientific theory is backed up by pieces of evidence hence it is not a mere guess.

A scientific theory is a well crafted explanation of an observed phenomenon. A scientific theory is different from a mere guess in the sense that the scientific theory must have some basis that support it.

A mere guess does not have any kind of data that supports it. Let us take the theory of evolution as an example. Countless discoveries of fossil evidences have shed some light on the probability of the theory. In this case, we can not consider it a mere guess since there is some kind of evidence that supports the claims of the theory.

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Mass of chromium contained within a sample of chromium (III) chloride with mass of 83.1g is 27.25 g

Given,

chlorine present in 15.8 g of sample of chromium (III) chloride is 10.6g

we have to find out mass of chromium present in 83.1 g of chromium (III) chloride.

First step is to find out mass percentage of chlorine and chromium atom in CrCl3.

No. of atoms of chromium in chromium (III) chloride = 1

molar mass of chromium = 52 g/mol

Total mass of element = 52 × 1 = 52

No. of atoms of chloride in chromium (III) chloride = 3

molar mass of chloride = 35.5g/mol

Total mass of element = 35.5 × 3 = 106.5

Total mass of chromium (III) chloride = 158.5 g/mol

mass percentage of chromium = 32.8 %

mass percentage of chloride = 67.1 %

So, the mass of chromium present in chromium (III) chloride = (32.8 / 100) × 83.1

= 27.25 g

Therefore mass of chromium in 83.1g of chromium (III) chloride is 27.25 g

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The velocity vs. time graph that corresponds to the info shown by the position vs. time graph is that the graph that has continuous acceleration (straight line).

The above statement of continuous acceleration means a relentless acceleration. A straight lines is just known to be a continuing acceleration that's said to be unchanging. Note that when there's a curved lines in a very graph, it implies that there's a non-constant acceleration. Therefore an object that's undergoing constant acceleration is one that may be seen in an exceedingly line. So therefore, the speed vs. time graph is one that matches with the information represented by the continual acceleration (straight line) on the graph.

Constant acceleration means that velocity changes at a constant rate with respect to time. If acceleration is made zero, velocity does not change. If acceleration is positive, the magnitude of velocity increases correspondingly.

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Answer:

your answer is c your welcome

Explanation:

The number of moles 2.44 x 10²⁴ H₂O molecules will be having is 4.05.

Converting between molecules and moles is done by either multiplying by or dividing by Avogadro's number.  To go from molecules to moles, divide the number of molecules by 6.02 x 10²³.

Avogadro's number, which is equal to 6.022 × 10²³, is the number of units in one mole of any material (defined as its molecular weight in grams). Depending on the substance and the nature of the reaction, the units could be electrons, atoms, ions, or molecules.

Thus,

No. of molecules = No. of moles × Avogadro no.

from the question we know,

No. of molecules = 2.44 × 10 ²⁴

Avogadro no. = 6.02 × 10²³

i.e. 2.44 × 10²⁴ = No. of moles  × 6.02 × 10²³

No. of moles = 2.44 × 10 ²⁴

                         6.02 × 10²³

No. of moles = 4.05

The number of moles 2.44 x 10²⁴ H₂O molecules will be having is 4.05.

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Answer:

3.83*10⁻²¹ [J].

Explanation:

1) formula:

E=hν, where ν=5.77*10¹²; h=6.63*10⁻³⁴;

2) according to the formula above:

E=577*10¹⁰*663*10⁻³⁶=382551*10⁻²⁶ [J]≈3.83*10⁻²¹[J].

Mateo and the officers should secure the crime scene.

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Answer:

c≈0.3418 [J/(gr*K)].

Explanation:

1) formula of heat:

Q=cm(T-t), where Q- energy of heat, c - required specifie heat, m - mass, T and t - initial and final temperatures;

2) according to the formula above:

[tex]c=\frac{Q}{m(T-t)};\\ c=\frac{596}{73*(50-26)}=0.34018264840182648401826484018265[\frac{J}{g*K}].[/tex]

P.S. the differrence in °C is equal the difference in °K.

The student’s test average points for the four test is 89.3 points

The Mean is defined as the arithmetic average. Mathematically, it can be expressed as:

Mean = (Summation of scores) / number of scores

The following data were obtained from the question:

Average = (Summation of scores) / number of test

Average = 357.3 / 4

Average = 89.3 points

Thus, the student’s test average points for the four test is 89.3 points

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