Use this equation for the question below : 2H2 + O2 --> 2H2O If 120 grams of oxygen (O2) is used, what mass of water (H2O) will be formed?
Moles of O2 = 120/32 = 3.75 moles
you need TWICE as many Moles of H2 3.75 x 2 = 7.5 moles of H2 7.5 x 2.016 = 15.12 gms oh h2
120gms of O2 + 15.12 gms H2 = 135.12 gms H20
