Question

The specific heat of water = 4200 J kg^–1 K^–1 and the latent heat of ice = 3.4 × 10⁵ J kg^–1. 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) 

(1) 69.3 

(2) 63.8 

(3) 64.6 

(4) 61.7

Answer 1

Answer is (4) 61.7

Here the water will provide heat for ice to melt therefore

Remaining ice will remain un-melted.