Mole Mass Conversions and Calculations

This video tutorial covers the mathematics of chemistry focusing on mole to mass conversions. It provides examples of converting moles to grams and grams to moles using substances like calcium carbonate, sodium sulfate, hydrogen sulfide, and sodium fluoride. The tutorial explains the concept of gram formula mass and demonstrates how to use it as a conversion factor. Each example emphasizes the importance of significant figures and unit cancellation in calculations.

What is the conversion factor used in mole mass conversions?

• 1 mole equals 1 gram

• Gram formula mass equals 1 mole of particles

• 1 mole equals 100 grams

• Gram formula mass equals 100 moles of particles

How many grams are in 2.5 moles of calcium carbonate?

• 300 grams

• 250 grams

• 200 grams

• 150 grams

Why is it important to consider significant figures in mole mass conversions?

• To ensure accuracy in calculations

• To make the process faster

• To simplify the conversion factor

• To avoid using a calculator

What is the gram formula mass of sodium sulfate (Na2SO4)?

• 142 grams per mole

• 100 grams per mole

• 160 grams per mole

• 120 grams per mole

How many grams are in 3 moles of sodium sulfate?

• 400 grams

• 450 grams

• 300 grams

• 426 grams

What is the gram formula mass of hydrogen sulfide (H2S)?

• 30 grams per mole

• 36 grams per mole

• 32 grams per mole

• 34 grams per mole

How many moles are in 68 grams of hydrogen sulfide?

• 1.5 moles

• 3.0 moles

• 2.0 moles

• 2.5 moles

What is the gram formula mass of sodium fluoride (NaF)?

• 46 grams per mole

• 42 grams per mole

• 40 grams per mole

• 44 grams per mole

How many moles are in 63 grams of sodium fluoride?

• 2.5 moles

• 1.0 moles

• 1.5 moles

• 2.0 moles

What should you do if you start with grams in a conversion problem?

• Place grams on the top of the conversion factor

• Place grams on the bottom of the conversion factor

• Ignore the grams

• Convert grams to liters first