The chemical reactions and the amount of the product expected from the stoichiometry are given below.
A) 2H2+O2⟶2H2O
32 g of oxygen gives 36 g of water.
∴1 g of oxygen gives 1.125 g of water. Similarly,
B) 3H2+N2⟶2NH3
28 g of nitrogen gives 34 g of ammonia.
1 g of nitrogen will give 1.214 g of ammonia.
C) H2+Cl2⟶2HCl
71 g of chlorine gives 73 g of HCl.
1 g of chlorine will give 1.028 g of HCl
D) 2H2+C⟶CH4
12 g of C gives 16 g of methane.
1 g of C will give 1.333 g of methane.