Question

The heat of formation of water is 260 kJ. How much $H_2O$ is decomposed by 130 kJ of heat ?

• A. 0.25 mol
• B. 1 mol
• C. 0.5 mol
• D. 2 mol

Answer 1

Answer: (C)

0.5 mol

Answer 2

Heat of formation of water is 260 kJ $\therefore$ 260 kJ of heat decomposes 1 mole of water. Hence 130 kJ of heat decomposes $\frac{1}{260} \times$130 = 0.5 mole of water.