the number 234.306 rounded off to five significant figures is

The new volume occupied by the carbon monoxide at the given pressure and temperature is approximately 10.27 Liters.

Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

P₁V₁/T₁ = P₂V₂/T₂

Given the data in the question;

Plug the given values into the above formula and solve for the final volume.

P₁V₁/T₁ = P₂V₂/T₂

P₁V₁T₂ = P₂V₂T₁

V₂ = P₁V₁T₂ / P₂T₁

V₂ = ( (726/760) × 7.48 × 250.15 ) / ( (444/760) × 298.0 )

V₂ = 1787.4139 / 174.0947

V₂ = 10.27 L

The new volume occupied by the carbon monoxide at the given pressure and temperature is approximately 10.27 Liters.

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The number of CT scans that a patient will have to undergo in order to feel mild radiation sickness would be 72 CT scans

The normal dose CT scan delivers 700 mrem.

700 mrem = 700 x [tex]10^{-3}[/tex] rem

700 x [tex]10^{-3}[/tex] rem is equivalent to 0.7 rem.

In order for a patient to feel mild radiation sickness, 50 rem is needed.

If 1 CT scan is equivalent to 0.7 rem, then how many CT scans will give 50 rem?

           = 50 x 1/0.7

                    = 71.429 scans

Since CT scans cannot be a fraction, we then need to approximate to the nearest whole number.

Thus, a total of 72 CT scans will be required for a patient to have a feeling of radiation sickness.

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The value of the following expression is 0.0429 rounded off to 0.043. The correct number of significant figures is 2.

The given expression (6.5 - 6.35) / 3.49  is calculated as below

(6.5 - 6.35) / 3.49

0.15 / 3.49

0.04297

0.043

Zeros to the left of the first non-zero digit are considered as not significant. For example 0.00765 has only 3 significant numbers.

When multiplying and dividing measured quantities, the output of the calculation should have the same number of significant figures as the measured quantity with the fewest significant figures. When performing multiple stage calculations, do not round intermediate stage calculation results; keep as many digits as is practical and round off only in the final output

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An atom with 15 protons and 16 neutrons is an atom of phosphorus, P. A neutral phosphorus atom has 15 electrons which is equal to number of proton.

A mineral called phosphorus is found in many foods naturally and can also be taken as a supplement. It has numbers of function in the body. It is a crucial component of cell membranes, bones, and teeth. It maintains a normal range of blood pH and aids in the activation of enzymes.

All tissues and cells require phosphorus for their growth, upkeep, and repair, as well as for the synthesis of DNA and RNA, the genetic building blocks. Additionally, other vitamins and minerals like vitamin D, iodine, magnesium, and zinc need phosphorus to be balanced and used.

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87.5 ml of Tween 20 is needed to prepare a 350 mL of a 25% Tween 20 (also called polysorbate 20) (v/v) solution in water via chemical lab methods.

By ethoxylating of Sorbian monolaurate in labs or in factories, a compound is formed that is a is a nonionic surfactant of the polysorbate type and is named as Polysorbate 20 or as we commonly call it as Tween 20.

Its other common commercial brand names can be stated as Kolliphor PS 20, Scattics, Alkest TW 20, Tween 20, and Kotilen-20 etc.

It can be employed as a detergent and emulsifier in a variety of home, academic, and pharmaceutical applications due to its stability and relative nontoxicity.

This Tween 20 is also used as a wetting agent in a wide range of flavored mouth drops and thus provides a spreading effect to the other ingredients present in it.

To prepare 350ml 25% Tween 20 v/v solution

25% is the volume of Tween 20 in the entire solution

Thus volume = 25% of 350

= 350 x (25/100)

= 87.5 ml

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The property which is least helpful in identifying a sample of matter is option D. Volume.

Property including melting factor, boiling factor, density, solubility, color, odor, and so on. is bodily houses. residences that describe how a substance modifications identity to produce a new substance are chemical houses.

The reactivity of a substance is a chemical property as opposed to physical assets. The purpose qualifies as a chemical property as it is predicated on its electron configuration to decide how it's going to behave around different substances.

A matter is an attribute of depending this is unbiased its chemical composition. Density, color, hardness, melting and boiling points and electric conductivity are all examples of physical properties.

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Answer: D Volume

Explanation:

The mass in milligrams of the drug present in 1 L of plasma is 5 * 10⁻⁵ mg

Plasma is the liquid part of blood which contains dissolved solutes such as ions, proteins and sugar.

Plasma concentration of fluid are important in general health, diagnosis and  treatment of diseases.

The plasma level of the drug was found to be 5ng/dL.

I dl = 1/10 L

1 dL = 0.1 L

1 ng =  1 * 10⁻⁶ mg

5 ng = 5 * 10⁻⁶ mg

The milligrams of drug are present in 1 L of plasma = 5 * 10⁻⁶ mg/0/ L

The milligrams of drug are present in 1 L of plasma = 5 * 10⁻⁵ mg

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The "di" prefix in the common name comes from the removal of two protons from phosphoric acid, [tex]H_3PO_4[/tex], during the formation of the [tex]HPO_4^2^-[/tex]anion. Calcium mono-hydrogen phosphate is another name for dibasic calcium phosphate.

An ion is basically an electrically charged atom or molecule. By convention, the charge of an electron is considered to be negative, and this charge is equal to and opposite to the charge of a proton, which is considered to be positive.

The common name's "di" prefix originates from the expulsion of two protons from phosphoric acid, [tex]H_3PO_4[/tex], even during establishment of the [tex]HPO_4^2^-[/tex] anion.

Thus, it can be concluded that the ions in the calcium hydrogen phosphate are calcium ion and hydrogen phosphate ion.

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Answer:

1.285 x 10²³ molecules CH₄

Explanation:

To find the amount of molecules in the sample, you need to (1) convert grams to moles (using the molar mass of CH₄) and then (2) convert moles to molecules (using Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 4 sig figs like the given value (3.423 = 4 sig figs).

Atomic Mass (C): 12.011 g/mol

Atomic Mass (H): 1.008 g/mol

Molar Mass (CH₄): 12.011 g/mol + 4(1.008 g/mol)

Molar Mass (CH₄): 16.043 g/mol

Avogadro's Number:

6.022 x 10²³ molecules = 1 mole

 3.423 g CH₄               1 mole                  6.022 x 10²³ molecules
-----------------------  x  -------------------  x  -------------------------------------------  =
                                   16.043 g                            1 mole

=  1.285 x 10²³ molecules CH₄

The percentage error of the recorded temperature is 2.9%

Percentage error = (absolute error / actual measurement) × 100

The following data were obtaned from the question:

The percentage error of the recorded temperature can be obtained as follow:

Percentage error = (absolute error / actual measurement) × 100

Percentage error = (1 / 34) × 100

Percentage error = 2.9%

Thus, the perecentage error of the recorded temperature is 2.9%

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Answer:

Hydrogen(H) is in fact explosive. So H and Oxygen have a strong bond which means when they have some sort of contact it will cause a reaction. H consists of one proton and one electron which means that this simple structure can cause a chemical reaction that could cause something to be flammable and easy to ignite, it happens when H comes in contact with the oxygen in the air it can cause some sort of explosion or something relatively similar.  I hope this makes sense.

Explanation:

Hope this helps:).........if not then sorry for wasting your time and may God bless you<3

Answer:

Lithium has more electrons than Hydrogen

Explanation:

Lithium has 2,1 electrons
Hydrogen has 1 electrons

1 mole of LiF has 2 moles of ions. Therefore, the given statement is true.

1 mole of LiF (s) contains 1 mole of [tex]Li^+[/tex] ion and 1 mole of [tex]F^-[/tex] ion.

So, total 2 moles of ions are present.

One fluorine (F) atom and one lithium (Li) atom can interact to produce the chemical compound Lithium Fluoride, or LiF.

LiF is an inorganic substance. It is a colorless solid that becomes white as the size of the crystals decreases. Lithium fluoride doesn't have an odor, but it tastes salty and unpleasant. Although it has a structure similar to sodium chloride, it is substantially less soluble in water. This is mostly due to LiF's stronger ionic nature. The ratio of lattice energy to hydration energy determines a compound's solubility in water.

Thus, the statement is true.

The complete question is:

A mole of LiF(s) contains 2 moles of ions. State whether the statement is true or false.

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Hydrogen is explosive, because when it is exposed to air, it reacts with oxygen, releasing heat and forms either water or hydrogen peroxide.

Hydrogen is the chemical element with the symbol H and atomic number    of  one (1).

Yes hydrogen is explosive. When hydrogen mixes with oxygen in the air, it forms an explosive mixture.

When molecular hydrogen and oxygen are combined and allowed to react together, energy is released and the molecules of hydrogen and oxygen can combine to form either water or hydrogen peroxide.

The reaction equation is given as;

H₂ + O₂ →  H₂O₂ + heat

This reaction is exothermic because it releases large amount of heat to the surrounding.

Thus, hydrogen is explosive, because when it is exposed to air, it reacts with oxygen, releasing heat and forms either water or hydrogen peroxide.

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The distance between them is 2.5 m.

Now we know that the Newton's law of gravity said that the gravitational force of attraction between two objects is directly proportional to the product masses of the objects and inversely proportional to the distance of separation.

Now, given that;

F = Gm1m2/r^2

F = gravitational force

G = gravitational constant

m1 = mass of the book

m2 = mass of the lamp

r = distance of separation

r = √ Gm1m2//F

r =  √6.67 * 10^-11 * 4 * 7/2.99 10^-10

r =2.5 m

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Missing parts;

A 4 kg book and a 7 kg lamp are both in the living room. If the force of gravity between them is 2.99 10-10 N, how far apart are they?

The final concentration of the solution is 2.75 * 10^-3 M.

We know that the stock solution is the solution from which we are able to prepare other solutions. The concertation of the stock solution is always seen to be higher than the concentrations of the other solutions that are obtained from it.

Given the dilution formula;

C1V1 = C2V2

C1 = initial concentration

C2 - final concentration

V1 - initial volume

V2 - final volume

Thus we have;

4.68 x 10^-3 M * 250 mL = C2 * 425 mL

C2 =  4.68 x 10^-3 M * 250 mL/425 mL

C2 = 2.75 * 10^-3 M

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Missing parts;

A cough syrup contains red dye #40, with a concentration of 4.68 x 10-3 M.a.If you dilute the cough syrup by adding 175 mL of water to a 250. mL sample of the cough syrup, what will be the final concentration?

You are given the mass of calcium and you are trying to determine the number of atoms. You do not have anything that converts directly from mass to atoms. But what you can do Is use the molar mass to convert two moles. And then use avocado dress number to convert to atoms. So that's the plan that you are going to follow. So you need to start with the massive calcium that we you are given. Which is 61.0 g of calcium. So the first step is to use the molar mass of calcium to convert two moles. You are given the Molar Mass. You told that one mole of calcium Is 40.08 g. If you were not given this information, you could find it on the periodic table. All. you know that you wanted grams and the denominator because you want grams to cancel. Right? So, that's your first step. You are now at moles of calcium. So now you need to convert to Adams. You should do that by using avocados. Number one mole of calcium or one mole of anything Is equal to 6.2 Times 10 to the 23rd particles. In this case, those particles will be atoms of calcium. So moles of calcium will cancel. And now you just need to calculate our answer rounding it to three significant figures. Because the measurement you were given for the mass has three significant figures. So do 61.0 divided by 40.08. And multiply by 6.02 times 10 to the 23rd. Rounding that 2, 3 significant figures, that's 9.16 Times 10 to the 23rd atoms of calcium. And that is our final answer. 9.16 times 10 to the 23rd calcium atoms.

2 moles of sodium hydroxide are required to react with 1 mole of sulfuric acid.

Stoichiometry refers to the relation which exists between quantities of reactant and products.It is based on the law of conservation of mass where the mass of the reactants is equal to the mass of the products.Conclusion which can be made by this statement is that reactants and products form a ratio of positive integers.

Considering the reaction between sodium hydroxide and sulfuric acid given in the question number of moles of sodium hydroxide can be found out that are required to react with 1 mole of sulfuric acid using stoichiometry concept.

H₂SO₄+2 NaOH[tex]\rightarrow[/tex]Na₂SO₄+ 2 H₂O

From the reaction it is clear that 1 mole of sulfuric acid reacts with 2 moles of sodium hydroxide

Therefore,1 mole of sulfuric acid would react with

1×2/1=2 moles of sodium hydroxide.

Thus, 2 moles of sodium hydroxide react with 1 mole of sulfuric acid.

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Answer:

3.90 Square Inch = 25.16124 Square Centimeter

Explanation:

How to convert Square Inch to Square Centimeter ? 1 square inch (in²) is equal to 6.4516 square centimeter (cm²).

The amount in moles of iron (II) oxalate that has a mass of 1.685 grams is 0.01170mol.

The number of moles in a substance can be calculated by dividing the mass of the substance by the molar mass.

According to this question, a student isolates 1.685 grams of iron (II) oxalate (FeC₂O₄).

Molar mass of FeC₂O₄ = 56 + 12(2) + 16(4) = 144g/mol

no of moles = 1.685g ÷ 144g/mol = 0.01170mol

Therefore, the amount in moles of iron (II) oxalate that has a mass of 1.685 grams is 0.01170mol.

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SO3 gas has the highest density.

A modified version of the ideal gas law is used to calculate density, replacing moles and volume with density and molar mass.

The relationship between a gas's density and molecular weight can be demonstrated using the ideal gas law equation. The formula is d = MP/RT, where d is the gas's density in kilograms per liter, M is its molar mass in grams per mole, P is its pressure in atmospheric pressure units, and R is the gas law constant. The equation demonstrates that the molar mass increases as gas density increases.

d = PM/RT

d ∝ M

CO = 28

CO2 = 44

SO3 = 80

Cl2 = 71

Thus SO3 will be more dense.

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Largest to smallest ionic radius

As3- >   Se2- >   Br- >   Rb+ >  Sr2+    ( ionic radius)

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A reaction which is carried out in a bomb calorimeter with Ccal = 5.01 kJ/°C, gives off 318 kJ of heat. The final temperature of the water in the calorimeter is 88.27°C

Now,

 according to the given question,

 The given data is :

    Ccal = 5.01 kJ/°C

   Heat (q) = 318 kJ

   Initial temperature = 24.8°C

   Final temperature = ?

Now we know that equation of bomb Calorimeter is given by;

q = cΔT

Hence,  

 318kJ =  5.01 kJ/°C ( T(final) - 24.8°C )

 T(final) = 88.27°C

Thus, from the above conclusion we can say that a reaction which is carried out in a bomb calorimeter with Ccal = 5.01 kJ/°C, gives off 318 kJ of heat. The final temperature of the water in the calorimeter is 88.27°C.

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Once hot air cools, it sinks to the earth's surface, here it is warmed by the ocean before rising back. This is known as a convection current.

Differential heating usually creates convection currents. Warmer (less dense) material rises, and cooler (more dense) material sinks.

The above movement is responsible for the formation of circulation patterns known as convection currents in the Earth's atmosphere, water, and mantle.

Convection currents in the Earth's mantle are thought to be the driving force behind tectonic plate movement.

Thus, convection current occurs when the air cools and begins to sink.

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The mass (in grams) of H₂O produced from the reaction is 2520 grams

We'll begin by writing the balance equation for the reaction. This is given below:

CH₄(g) + 2O₂(g) -------> CO₂(g) + 2H₂O(g)

From the balanced equation above,

1 mole of CH₄ reacted to produce 2 moles of H₂O

Therefore,

70 moles of CH₄ will react to produce = 70 × 2 = 140 moles of H₂O

Finally, we shall determine the mass of water, H₂O produced from the reaction as follow:

Mole = mass / molar mass

Cross multiply

Mass = mole × molar mass

Mass of water, H₂O = 140 × 18

Mass of water, H₂O = 2520 grams

Thus, 2520 grams of water, H₂O were obtained from the reaction

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Answer:

He

Explanation:

Helium is a gas, not a metal.

Among the following option c "2g of Mg" is correct answer. 2g of Mg contains one mole of neutrons.

What is neutron?

The neutron is a neutral subatomic particle that, with the exception of common hydrogen, is a component of every atomic nucleus. Its rest mass is 1.67492749804 1027 kg, which is slightly more than that of the proton but 1,838.68 times higher than that of the electron. It has no electric charge.

Since you are taking the mass of magnesium (2 g) and dividing by the molecular mass of magnesium (24 g/mol), the formula

[tex]amount of substance=\frac{mass}{molar mass}[/tex]

informs you that you have 1/12 moles of magnesium. The quantity of magnesium in the question is not, however, being asked.

Each magnesium atom contains 12 neutrons (24 - 12). As a result, 1/12 moles of magnesium contain 1 mole of neutrons (1/12)(12).

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The percentage error of the recorded temperature is 2.9%

Percentage error = (absolute error / actual measurement) × 100

The following data were obtaned from the question:

The percentage error of the recorded temperature can be obtained as follow:

Percentage error = (absolute error / actual measurement) × 100

Percentage error = (1 / 34) × 100

Percentage error = 2.9%

Thus, the perecentage error of the recorded temperature is 2.9%

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