Calculate the mass fraction of carbon in pentane C5H12 and pentane C5H10.

univerkov | December 21, 2020 | education

1) Calculate the molar mass of pentane C5H12:
M (C5H12) = 5Ar (C) + 12Ar (H) = 12 * 5 + 12 = 60 + 12 = 72 g / mol
Let’s find the mass fraction of carbon in pentane:
w (C) = M (C) / M (C5H12) * 100% = 60/72 * 100% = 83.3%
2) Calculate the molar mass of pentene C5H10:
M (C5H10) = 12 * 5 + 10 = 60 + 10 = 70 g / mol
Find the mass fraction of carbon in pentene:
w (C) = 60/70 * 100% = 85.7%

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