Chapter 10 Textbook Questions

What is STP?

Standard temperature and pressure.

What is molar volume?

1. STP unit of measure for volume 2. 22.4 L

How do you determine the molar mass of an element? How do you determine the molar mass of a compound?

1. The atomic mass of an element expressed in grams is the mass of a mole of the element. 2. To calculate the mass of a compound, find the number of grams of each element in one mole of the compound. Then add the masses of the elements in the compound.

What does the volume of a gas vary with?

A change in temperature or a change in pressure.

What is the point of Avogadro's hypothesis?

An explanation to why the volume of gases is more predictable than liquids and solids.

How do chemists count the representative particles in a substance?

By using the mole.

What is Avogadro's hypothesis?

Equal volumes of gases at the same temperature and pressure contain equal numbers of particles.

What do you need to know to convert among the count, mass, and volume of something?

Knowing how the count, mass, and volume of an item relate to a common unit allows you to convert among these units.

How do you convert between the volume of a gas at STP and the number of moles of the gas?

The molar mass volume is used to convert between the number of moles of gas and the volume of the gas at STP.

How do you convert between the mass and the number of moles of a substance?

Use the molar mass of an element or compound to convert between the mass of a substance and the moles of the substance.