CHEMISTRY HIGH SCHOOL

3. How many atoms are found in 0.000256 moles?

Answers

Answer 1
Answer:

Answer:

1.54×10^20 atoms

Explanation:

It'sdonebyusingtherelation

N=n×Lwhere,

N=numberofentitiespresent

n=amountofsubstance (mole)

L=Avogadro'sconstantwhichis6.02×10^23

nowfromthequestion, given

n=0.000256

AndL=6.02×10^23

N=0.000256×6.02×10^23

N=1.54×10^20atoms

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Which statement best explains why heating a liquid affects its viscosity?

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The statement that best explains why heating a liquid affects its viscosity is that "The molecules move faster at higher temperatures and overcome attractions more easily.". Remember that viscosity is a physical property of the fluids that measure the resistance (opposition) to flow and it, generally decreases, as the temperature increases and the intermolecular force decrease.

Answer:

aka: A

Explanation:

How many moles are in 68.5 liters of oxygen gas at STP?

Answers

We can solve this problem when we use the conditions of a gas at standard temperature and pressure. It has been established that at STP where the temperature is 0 degrees Celsius and the pressure is 101.325 kPa, the volume of 1 mole of gas is 22.4 L. We will use this data for the calculations.

68.5 L ( 1 mol O2 / 22.4 L O2 ) = 3.06 mol O2

Explanation:

It is known that at STP, there are 22.4 L present in one mole of a substance.

Therefore, in 68.5 liters there will be 1 mol divided by 22.4 L times 68.5 L.

Mathematically,      68.5 L * (1 mol O_(2))/(22.4 L)

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Hence, we can conclude that there are 3.05 moles present in 68.5 liters of oxygen gas at STP.

Which temperature change would cause the volume of a sample of an ideal gas to double when the pressure of the sample remains the same?

Answers

Following the ideal gas law PV = nRT, and changing it in terms of temperature, we get T = PV/nR. When volume of a sample of an ideal gas to double when the pressure of the sample remains the same, the temperature doubles because temperature is directly proportional with pressure and volume.

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Answers

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How many oxygen atoms are contained in the following chemical formula? 2agno3 a. 2
b. 3
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d. 6

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