Understanding Avogadro's Number and the Mole

What is the primary focus of this chemistry lesson?

• The periodic table

• Avogadro's number and the mole

• Chemical reactions

• Organic chemistry

According to Avogadro's hypothesis, what do equal volumes of gases at the same temperature and pressure contain?

• Different masses

• Equal masses

• Equal numbers of molecules

• Different numbers of molecules

What is the atomic mass unit based on?

• The mass of a nitrogen atom

• The mass of an oxygen atom

• 1/12 the mass of a carbon-12 isotope

• 1/12 the mass of a hydrogen atom

How do you calculate the molecular mass of a compound?

• By subtracting the atomic masses of all elements in the compound

• By dividing the atomic masses of all elements in the compound

• By adding the atomic masses of all elements in the compound

• By multiplying the atomic masses of all elements in the compound

What is Avogadro's number?

• 144

• 2

• 12

• 6.022 x 10^23

What does one mole of a substance represent?

• 6.022 x 10^23 units of the substance

• 144 units of the substance

• 2 units of the substance

• 12 units of the substance

How is molar mass defined?

• The mass of one atom of a substance in grams

• The mass of one liter of a substance in grams

• The mass of one molecule of a substance in grams

• The mass of one mole of a substance in grams

What is the molar mass of hydrogen?

• 1.01 g

• 16 g

• 14.01 g

• 32 g

How do you find the molar mass of a compound?

• By subtracting the molar masses of all elements in the compound

• By dividing the molar masses of all elements in the compound

• By multiplying the molar masses of all elements in the compound

• By adding the molar masses of all elements in the compound

What is the molar mass of nitric acid (HNO3)?

• 1.01 g

• 63.02 g

• 48 g

• 14.01 g