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3 January, 09:14

What is the percent composition of carbon in heptane c7h16

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  1. 3 January, 09:24
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    Answer: the percent composition of carbon in heptane is 83.9%

    Explanation:

    1) Atomic masses of the atoms:

    C: 12.01 g/mol H: 1.008 g/mol

    2) Molar mass of heptane:

    C₇H₁₆: 7 * 12.01 g/mol + 16*1.008 g/mol = 100.2 g/mol

    3) Mass of carbon in one mole of heptane:

    C₇: 7 * 12.01 g/mol = 84.07 g/mol

    3) Percent composition of carbon:

    % = (mass in grams of C) / (mass in grams of C₇H₁₆) * 100 =

    = (84.07 g / 100.2 g) * 100 = 83.9% ← answer
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