E.g. Calculate the mass of oxygen which will react exactly with 0.64g sulfur dioxide according to the equation:
2SO2 + O2 --> 2SO3
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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