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bezimeni [28]
3 years ago
13

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

Chemistry
1 answer:
JulsSmile [24]3 years ago
4 0

Answer:

  • <em>Option d, 84%</em>

Explanation:

<u>1) Determine the molar mass of the heptane</u>

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

<u>2) Percent of carbon, %</u>

  • % = (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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