**You can use Moles to calculate Masses in equations**

*The big numbers in front of the chemical reactants and products in a balanced equation tell you how many moles there are.*

**You Can use this formula to work out mass/moles or formula of atomic mass with the below method:**

1. Fill in grid with the data from the question (Grid should consist of balanced equation, then mass in g, then Ar/Mr and then moles)

2. Calculate formula mass of each compound

3.Calculate Number of moles of known value

4. Use a ratio to find unknown moles

5.Calculate unkown mass

**Or**

1. Ignore any big numbers and fill out Ar/Mr row

2. Work out ratio (use big numbers)

3. Work out mass

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