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28 January, 22:11

A chemistry student combines 32 grams of one chemical and an unknown amount of another chemical in a closed system. A chemical reaction occurs and the mass of the products is 114 grams. How much of the unknown chemical was used in the reaction?

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  1. 28 January, 22:27
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    The reaction used 82 g of the unknown chemical.

    The word equation is

    Chemical 1 + Chemical 2 → Products

    32 g + x g → 114 g

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

    32 g + x g = 114 g

    x = 114 - 32 = 82

    The mass of Chemical 2 was 82 g.
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