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21 May, 21:10

During a combustion reaction, 12.2 grams of methane reacts with 14 g of oxygen. The reaction produces carbon dioxide and water. If 20 grams of water are produced, how many grams of carbon dioxide are produced?

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  1. 21 May, 21:21
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    The reaction produces 6 g of carbon dioxide.

    The word equation is

    methane + oxygen → carbon dioxide + water

    12.2 g + 4 g → x g + 20 g

    The Law of Conservation of Mass tells us the total mass of the reactants must equal the mass of the products. Then

    12.2 g + 14 g = x g + 20 g

    x = 12.2 + 14 - 20 = 6

    The mass of carbon dioxide is 6 g.

    Note: The answer can have no decimal places because you gave none for the masses of oxygen and water.
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