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JAMB Physics 1993 Question 19

Question 19

Change of State and Vapours

The melting point of a solid is given as 80°C. If 105 J of heat energy is required at this temperature to melt 10g of the solid, the specific latent heat of fusion of the solid is

  1. A.1.00 × 103 J kg−1
  2. B.1.25 × 105 J kg−1
  3. C.1.00 × 107 J kg−1
  4. D.8.00 × 108 J kg−1.
Show the answer and explanation

Answer: C (1.00 × 107 J kg−1)

Explanation

L = Q/m = 105 ÷ 0.010 = 1.00 × 107 J kg−1.