Worksheet on Molar Conversions

Conversion Rules & Guidelines

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# of Moles to Grams = multiply by molar mass

Grams to # of Moles = divide by molar mass

# of Moles to # of Particles = multiply by Avogadro's #

# of Particles to # of Moles = divide by Avogadro's #

# of Moles to the volume of a gas at STP = multiply by 22.4 L

The volume of a gas at STP to # of moles = divide by 22.4 L __________________________________________________

1. What would be the volume of 1.50 moles of CO₂ gas at STP?

2. How many molecules are there in 4.5 moles of CO₂?

3. What is the mass of 8.45 moles of CO₂?

4. How many moles does 66.0 grams of CO₂ represent?

5. How many molecules dies 80.0 grams of H₂O represent?

ANSWERS:

1. 33.6 L

2. 2.709 x 10²⁴

3. 372 grams

4. 1.5 moles

5. 2.67 x 10²¹

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