Question

1 C3H8 + 5 O2 → 3 CO2 + 4 H2O

What mass of O2 is needed to react with 48.05 g C3H8?

Answer 1

Number of moles of C3H8 used = 48.05 ÷ 44 = 1.092 mole

1 mole C3H8 reacts with 5 moles O2

1.09 moles C3H8 will react with : 5 × 1.092 = 5.46 moles O2