Question

C5H12  +8O2 → 5CO2   + 6H2O
formula
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Answer 1

Complete combustion of pentane: C5H12 + 8O2 → 6H2O + 5CO2 ... balanced equation

moles C5H12 used = 10.0 g C5H12 x 1 mol/72 g = 0.139 moles pentane

moles O2 consumed = 0.139 mol C5H12 x 8 mole O2/1 mol C5H12 = 1.11 moles O2

mass O2 consumed = 1.11 moles O2 x 32 g/mole = 35.5 g O2