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Question Q126) 4 g of hydrogen reacts with 16 g of oxygen to form water. The mass of water formed is


2H2 + O2 → 2 H2O
Form above equation
Two moles of hydrogen reacts with one mole of Oxygen to give two moles of water
Or 4 g of hydrogen reacts with 32 g of oxygen to produce 36g of water
It is given oxygen is 16g
Now 32g oxygen reacts with 4g of hydrogen
∴ 16 g oxygen reacts with = 16×4/32 = 2.0 g of Hydrogen
Thus water produced = 16+2.0 = 18g
Answer : (d)