1 c m 3 of water at its boiling point absorbs 540 calories of heat to become steam with a volume of 1671 c m 3 . If the atmospheric pressure is 1.013 × 10 5 N / m 2 and the mechanical equivalent of heat = 4.19 J/calorie, the energy spent in this process in overcoming intermolecular forces isA) 540 calorieB) 40 calorieC) 500 calorieD) Zero

Question

1  c      m    3   of water at its boiling point absorbs 540 calories of heat to become steam with a volume of   1671  c      m    3  .  If the atmospheric pressure is   1.013  ×      10    5    N      /        m    2   and the mechanical equivalent of heat = 4.19 J/calorie, the energy spent in this process in overcoming intermolecular forces isA) 540 calorieB) 40 calorieC) 500 calorieD) Zero

Jerimiah Short · Accepted Answer

The correct answer is  500 calorie Energy spent in overcoming  inter molecular forces ΔU=ΔQ−ΔW=ΔQ−P(V2−V1)=540−1.013×105(1671−1)×10−64.2≈500 calorie

1cm^3 of water at its boiling point absorbs 540 calories of heat to become steam with a volume of 1671cm^3.

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