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Q.

A fish swimming in water body when taken out from the water body is covered with a film of water of weight 36 g. When it is subjected to cooking at 100°C, then the internal energy for vaporization in kJ mol-1 is _______. (nearest integer)

Assume steam to be an ideal gas. Given AvapH for water at 373 K and 1 bar is 41.1 kJ mol-1; R = 8.31JK-1 mol-1

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answer is 38.

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Detailed Solution

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H2O (l)  H2O(g)

n = 3618= 2 mol

U = H - ngRT

        =41.1 - 1 x 8.31 x 3731000 kJ/mol

        = 38 kJ/mol

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