Sarthaks Test
+2 votes
in Chemistry by (1.3k points)

A copper block of mass 2.5 kg is heated in a furnace to a temperature of 500oC and then placed on a large ice block. The maximum amount of ice that can melt is (Specific heat of copper = 0.39 Jg-1oC-1, latent heat of fusion of water = 335 Jg-1)
(A) 1.2 kg
(B) 1.455 kg
(C) 1 kg
(D) 2.5 kg

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1 Answer

+2 votes
by (15.0k points)

We know 
heat loss = heat gain 
maximum heat loss by copper block = mSdT
=2500 g x 0.39 jg-1k-1 x (500-0) k
=487, 500 j

487500 j=M L
where M is the mass of ice melted and L is latent heat of fusion.
487500 j = M x 335 Jg-1
M=1455.22 g =1.45522 kg

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