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Latent heat of vaporisation of a liquid at 500 K and 1 atm pressure is 10.00 Kcal/mol. What will be the change in internal energy (ΔU) of 3 mol of liquid at same temperature ?
  • a)
    13.0 Kcal
  • b)
    -13.0 Kcal
  • c)
    27.0 Kcal
  • d)
    -27.0 Kcal
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Latent heat of vaporisation of a liquid at 500 K and 1 atm pressure is...
Vaporization of 3 moles of H2O vapors is: 3H2O(l) → 3H2O(g)
Δn = 3 - 0 = 3
Therefore,
ΔU = ΔH - ΔnRT
= (3 x10) - 3(0.002)(500) = 27
change in internal energy is:
ΔU = 27 Kcal
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Latent heat of vaporisation of a liquid at 500 K and 1 atm pressure is 10.00 Kcal/mol. What will be the change in internal energy (ΔU) of 3 mol of liquid at same temperature ?a)13.0 Kcalb)-13.0 Kcalc)27.0 Kcald)-27.0 KcalCorrect answer is option 'C'. Can you explain this answer?
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