question_answer

Calculate the amount of heat (in calories) required to convert 5 gm of ice at 0°C to steam at 100° [DPMT 2005]

A)            3100                                         

B)            3200

C)            3600                                         

D)            4200

Correct Answer: C

Solution :

                   Ice (0°C) converts into steam (100°C) in following three steps.                    Total heat required \[Q={{Q}_{1}}+{{Q}_{2}}+{{Q}_{3}}\]            \[=5\times 80+5\times 1\times (100-0)+5\times 540=3600\,cal\]