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When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 20.4 g of carbon were burned in the presence of 71.1 g of oxygen, 16.7 g of oxygen remained unreacted. What mass of carbon dioxide was produced?

Express your answer to three significant figures and include the appropriate units.

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2 answers
  1. C + O2 ---> CO2

    Mols of C
    20.4 /12 g/mol = 1.7 mol of C
    result is 1.7 mol of CO2
    C = 12
    O2 = 32
    CO2 = 44 g/mol

    1.7 mol * 44 g/mol = 74.8 grams

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  2. How much heat is evolved if 2 moles of C3H8 is burned?

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