What is the percent composition of carbon in heptane c7h16

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