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27. 540 calories of heat convert 1 cubic centimeter of water at 100°C into 1671 cubic centimeter of steam at 100°C  at a pressure of one atmosphere. Then the work done against the atmospheric pressure is nearly

(a)  540 cal                               (b)  40 cal

(c)   Zero cal                              (d)  500 cal

Answer-b

(5)

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