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Question

80 g of water at `30^circ C` is poured on a large block of ice at `0^circ C` .The mass of the ice that melts is :


Options:
A .  160 g
B .  80 g
C .  40 g
D .  30 g
Answer: Option D

By the principle of calorimety    Heat lost = heat gain

         `Ms Delta theta `= mL

where :    m = mass of ice

M = mass of water = 80g

s = specific heat of water = 1 cal/`g^circ C`

`Delta theta` = temperature of water = `30^circ`

L = latent heat of ice = 80 cal/g

So,    80 x 1 x`30^circ` = m x 80

Hence ,         m = 30 g.  



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