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540 calories of heat convert 1cc of water at 100°C to 1671 cc of steam at 100°C under atmospheric conditions. Increase in initial energy will be nearly :

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20 calorie

500 calorie

300 calorie

540 calorie

answer is C.

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Detailed Solution

$\begin{array}{l} ΔW = (1 .01 \times 10^{5}) (1671 - 1) \times 10^{- 6} \\ = 168 .67 J \\ \approx 40 cal \\ From first law of thermodynamics \\ \Rightarrow ΔU = 500 cal \end{array}$

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