Molar Quantities

An aluminum can has a mass of 6.75 grams. How many moles of aluminum are used to make this can?

• 0.25 moles

• 0.50 moles

• 0.75 moles

• 1.00 moles

An aluminum can has a mass of 15.8 grams. How many moles of aluminum are in this can?

• 0.58 moles

• 0.45 moles

• 0.75 moles

• 0.65 moles

How many moles of copper are there in the copper sample shown?

• 0.5 moles

• 1.0 moles

• 1.5 moles

• 2.0 moles

How many atoms of magnesium are in a 24.3 g sample of magnesium?

• 6.02 x 10²³ atoms

• 1.20 x 10²⁴ atoms

• 3.01 x 10²³ atoms

• 2.00 x 10²³ atoms

True or False:

A mole is a large number used to simplify the counting of atoms.

• True

• False

• A small number used for counting molecules

• A unit of mass for measuring atoms

How many moles of copper are there in a copper sample of mass 31.7 g?

• 0.50 moles

• 0.25 moles

• 0.75 moles

• 1.00 moles

True or False:

Particles counted by moles can only be atoms.

• True

• False

• Only molecules

• Only small particles

How many atoms of magnesium are in a 1 mole sample of magnesium?

• 6.02 x 10²³ atoms

• 3.01 x 10²³ atoms

• 1.20 x 10²⁴ atoms

• 4.00 x 10²² atoms

What is the mass of 9 red apples in kilograms if a dozen weighs 0.50 kg?

• 0.25 kg

• 0.38 kg

• 0.50 kg

• 0.42 kg

What is the mass of 6 red apples in kilograms if a dozen weighs 0.50 kg?

• 0.25 kg

• 0.50 kg

• 0.75 kg

• 0.10 kg