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JAMB Physics 2005 Question 45

Question 45

Change of State and Vapours

106J of heat is required to boil off completely 2 kg of a certain liquid. Neglecting heat lost to the surroundings, the latent heat of vaporization of the liquid is

  1. A.5.0 × 105J kg−1.
  2. B.2.0 × 105J kg−1.
  3. C.5.0 × 106J kg−1.
  4. D.2.0 × 106J kg−1.
Show the answer and explanation

Answer: A (5.0 × 105J kg−1.)

Explanation

L = Q/m = 106 ÷ 2 = 5.0 × 105 J kg−1.