Question

Calculate the mass (in g) of O2 consumed in the complete combustion of 47.5 g sample of C4H8O. (Hint, write the balanced equation.)

Answer 1

2C4H8O + 11O2 ==> 8CO2 + 8H2O

moles C4H10O = grams/molar mass = 47.5/72 = 0.66
moles O2 consumed = mols C4H8O x (11 mols O2/2 mols C4H8O) = 0.66 x (11/2) = ?
Then grams O2= mols O2 x molar mass O2 = ?
post your work if you get stuck.