What is the percent composition of carbon in heptane c7h16

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What is the percent composition of carbon in heptane, C7H16?

a. 12%
b. 68%
c. 19%
d. 84%.

• Option d, 84%

Explanation:

1) Determine the molar mass of the heptane

element   # of atoms    atomic mass        total mass

C              7                  12.011 g/mol         7×12.011 g/mol = 84.077 g/mol

H             16                  1.008 g/mol         16×1.008 g/mol = 16.128 g/mol

-------------------

Molar mass =    100.205 g/mol

2) Percent of carbon, %

• % = (mass of element / molar mass )×100

= (84.077 g/mol / 100.205 g/mol )×100 = 83.83 %

• Round to two significant figures: 84% ← answer

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