What amount of water will be obtained if 16 g of oxygen entered the reaction of hydrogen combustion?

let’s compose the reaction equation:
2H2 + O2 = 2H2O
the molecular weight of oxygen is 32, the weight is known to us. find the amount of substance:
n (O2) = m: M = 16: 32 = 0.5 mol
according to the reaction equation, for 1 mole of oxygen there is 2 mole of water – therefore, for 0.5 mole of oxygen there is 1 mole of water
Answer: 1 mole