What is the percent composition of carbon in heptane c7h16


Asked by wiki @ in Chemistry viewed by 167 People


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

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

Answered by wiki @



Answer:

  • 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


Do you know the better answer?

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