Question

Calculate the amount of heat (in calories) required to concert 5 g m ice at $0^{\circ }C$ to steam at ${100}^{\circ }$

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

Answer 1

The correct option is C 3600

Heat required to melt 5g of ice at 0°C to water at 0°C = 5g × 80 calorie per gram= 400 calorie.

Heat required to raise the temperature of 5g of water from 0°C to 100°C = 5g × 1calorie/g/1°C rise of temperature× 100°C= 500 calorie

Heat required to convert water at 100°C to steam at 100°C = $5g\times 540cal/g=2700cal.$

Therefore total heat required = $400+500+2700=3600cal$