E.g. Calculate the mass of oxygen which will react exactly with 0.64g sulfur dioxide according to the equation:

**2**SO2 + O2 --> **2**SO3

1. **MAKE SURE THE EQUATION IS BALANCED BEFORE BEGINNING**

2. **Work out the number of moles of sulfur dioxide.** (0.64 / 32 + 16 + 16 = 0.01 mole)

3. **Find the reaction ratio from the equation.** (2 moles of sulfur dioxide react with 1 mole of oxygen so the ratio is 2:1)

4. **Use the ratio to find the number of moles of oxygen needed.** (0.01 / 2 = 0.005 moles of oxygen)

5. **Find the mass of 0.005 moles of oxygen.** (0.005 * (16 + 16) = 0.16g)

ANSWER = 0.16g oxygen will react with 0.64g sulfur dioxide.

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