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If the density water of 1gm cm-3 changes to 6.25 x 10 gm cm 3 when 1gm is converted to vapour, then the work

If the density water of 1gm cm-3 changes to 6.25 x 10 gm cm 3 when 1gm is converted to vapour, then the work done against 1 atmospheric pressure of 10 Pa is (A) 160J (B) 625J (C) 312.5J (D) 82.3J

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