What is the percent composition of carbon in heptane c7h16

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Tiara Rutherford · Accepted Answer

the percent composition of carbon in heptane is 83.9% Explanation:1) Atomic masses of the atoms:C: 12.01 g/molH: 1.008 g/mol 2) Molar mass of heptane:C₇H₁₆: 7 × 12.01 g/mol + 16×1.008 g/mol = 100.2 g/mol3) Mass of carbon in one mole of heptane:C₇: 7 × 12.01 g/mol = 84.07 g/mol3) 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

Tiara Rutherford · Answer

83.90 percent.

Tiara Rutherford · Answer

Option d, 84%Explanation:1) Determine the molar mass of the heptaneelement   # 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/mol2) 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

Dr. Frankie Medhurst

What is the percent composition of carbon in heptane c7h16

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