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Q.

10 gm of ice at 0° C is kept in a calorimeter of water equivalent 10 gm. How much heat should be supplied to the apparatus to evaporate the water thus formed? 

(Neglect loss of heat, LV=540 cal/gm, and Lf=80 cal/gm

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a

6200 cal

b

13600 cal

c

8200 cal

d

7200 cal

answer is D.

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Detailed Solution

Heat supplied is Lfusion+McΔT+MLvap
Q1=10×336+10×4.2×100+10×2260
Q1=30160Jor7200cal
Heat for calorimeter Q2=10×1×100=1000cal

Q=Q1+Q2=8200cal

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