Name ______Period ______

Mole Conversions Worksheet

First know that:

  • Mass is measured in grams. “Find the mass of” means find the number of grams.
  • Volume is measured in liters. “What is the volume of” means find the number of liters.
  • Particles are atoms, molecules or formula units.

Converting between / to moles / from moles
/ grams and moles: use molar mass (add up masses from periodic table)
/ liters and moles of a gas at STP
/ particles and moles (particles are atoms, molecules or formula units)

Mole conversion steps:

  1. Identify what you are converting from and what you are converting to.
  2. Determine if the conversion is one or two steps:
  3. If either the from or the to is moles, then the conversion requires only a single step.
  4. If neither the from nor the to is moles, then two steps are required. In the first step you will convert to moles and in the second step, from moles.
  5. Set up the problem:
  6. Write the given value (the from).
  7. Multiply by the conversion factor (see table above). What you are converting to goes in the numerator and what you are converting from goes in the denominator.
  8. Solve the problem. Show how units cancel and use the correct number of significant digits.

Name ______Period ______

One step example

What is the mass of 1.673 moles of copper?

From: molesTo: grams

1.673 mol x = 106.3 g

Problems

Two step example

What is the volume of 9.36 g of methane gas (CH4) at STP?

From: gramsTo: liters

9.36 g x x = 13.1 L

Name ______Period ______

  1. What is the mass of 0.46 mol of MgCl2?

From: molesTo: grams

  1. How many moles is 1.438 g of HCl?

From: gramsTo: moles

  1. How many liters at STP is 0.22 mol of neon?

From: molesTo: liters

  1. How many atoms is 0.85 g of gold (Au)?

From: gramsTo: atoms

  1. What is the volume at STP of 33.1 g of hydrogen gas (H2)?

From: gramsTo: liters

  1. How many atoms are there in 7.2 moles of iron (Fe)?

From: molesTo: atoms

  1. How many molecules are in 3.78 x 10-3 moles of water?

From: molesTo: molecules

  1. How many moles is 5.38 x 1021 atoms of sodium?

From: atomsTo: moles

  1. What is the volume at STP of 2.74 x 1024 atoms of argon gas?

From: atomsTo: liters

  1. How many moles is 12.56 L of carbon dioxide gas at STP?

From: litersTo: moles

  1. What is the mass of 837 L of methane gas (CH4) at STP?

From: litersTo: grams

  1. How many molecules are in a weather balloon filled with 102 L of air at STP?

From: litersTo: molecules

  1. A container holds 10.4 L at STP of SO2 gas. What is the mass of the gas?

From: litersTo: grams

  1. What is the mass of 3.51 x 1025 molecules of acetylene gas (C2H2)?

From: moleculesTo: grams

  1. If 437 g of helium are released into a balloon at STP, what will the volume be?

From: gramsTo: liters

  1. How many molecules of hemoglobin are there in 8.4 x 10-3 g? The molar mass of hemoglobin is approximately 68,000 g/mole.

From: gramsTo: molecules