How many grams of H2O will be produced when 3.35 x 10^4 mg of pentane reacts with excess Oxygen?

Question

C5H12 8O2=5CO2 6H2O

Answer 1

Moles C5H12 = 33.5 g / 72.15  g/mol = 0.464

the ratio between C5H12 and H2O is 1 : 6

moles water = 0.464 x 6 =2.78

mass water = 2.78 mol x 18.02 g/mol =50.2 g