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The latent heat of vaporisation of water is 2,240 J. If the work done in the process of vaporisation of 1g is 168 J, then the increase in internal ene

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The latent heat of vaporisation of water is 2,240 J. If the work done in the process of vaporisation of 1g is 168 J, then the increase in internal energy is?

(a) 2408 J

(b) 2240 J

(c) 2072 J

(d) 1904 J
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Right choice is (c) 2072 J

Easy explanation: From the first law of thermodynamics,

dQ = mL = dU + dW

dU = m L – dW = 1×2240-168

dU = 2072 J.
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