7.2: Mass-Mole Conversions

Multiple Choice

How many pieces are in a mole?

• 6.02x10²³

• 6.02x10²²

• 6.02x10²⁴

• 6.02x10²⁰

Multiple Choice

A chemist places 2.50 g of iron on a scale. How many moles of iron are on the scale?

• 139.6 moles

• 22.3 moles

• 0.764 moles

• 0.045 moles

Multiple Choice

To melt the ice, Cindy throws 455 g of calcium chloride, CaCl₂ on her sidewalk. How many moles of CaCl₂ did she throw?

• 50,500 moles

• 4.10 moles

• 0.244 moles

• 111 moles

Multiple Choice

How many grams are there in 1.5 moles of ammonia (NH3)?

• 255.45

• 25.545

• 0.255

• 2.5545

Multiple Choice

What is the mass of 3 moles of calcium carbonate (CaCO3)?

• 150.09 g

• 900.81 g

• 450.27 g

• 300.27 g