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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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