How many moles of carbon dioxide will form if 5.5 moles of C3H8 is burned

The reaction involved in above question is,

C3H8 + 5O2 → 3CO2 + 4H2O

(1mol) (3mol)

Thus, complete combustion of 1 mole of C3H8 produces 3 moles of CO2

∴ 5.5 moles of C3H8 (if burnt completely) will produce 5.5 X 3 = 16.5 moles of CO2