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19 g of water at 30°C and 5 g of ice at -20°C are mixed together in a calorimeter. What is the final temperature of the mixture? (Given, specific heat of ice = 0.5 cal g-1 (C0)-1 and latent heat of fusion of ice = 80 cal g-1)

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a

0°C

b

-5°C

c

5°C

d

10°C

answer is C.

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Detailed Solution

Heat gained = Heat lost⇒5×0.5×20+5×80+5×1×(θ-0)=19×1×(30-θ) ⇒ θ=5oC

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19 g of water at 30°C and 5 g of ice at -20°C are mixed together in a calorimeter. What is the final temperature of the mixture? (Given, specific heat of ice = 0.5 cal g-1 (C0)-1 and latent heat of fusion of ice = 80 cal g-1)