Question

Calculate the amount of heat (in calories) required to convert 5 gm of ice at 0°C to steam at 100°C

• A. 3100
• B. 3200
• C. 3600
• D. 4200

Answer 1

Answer: (C)

3600

Answer 2

Ice (0°C) converts into steam (100°C) in following three steps.

Total heat required

$Q = Q_{1} + Q_{2} + Q_{3} = 5 \times 80 + 5 \times 1 \times (100 - 0) + 5 \times 540 = 3600cal$