Q.

The specific heat of water =4200  J  kg-1K-1  and the latent heat of ice  =3.4×105  J  kg1. 100 grams of ice at  0°C is placed in 200 g of water at  25°C. The amount of ice that will melt as the temperature of water reaches  0°C is close to (in grams) :

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a

64.6

b

63.8

c

69.3

d

61.7

answer is A.

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Detailed Solution

 

Question Image

Heat extracted out of system  =0.2420025=21000J
So amount of ice melt  =QL=210003.4×105  kg
=2103.4g=61.76  gm
 

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