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Question

The graph shown in the figure represent change in the temperature of 5 kg of a substance as it abosrbs heat at a constant rate of 42 kJ min–1 The latent heat of vapourazation of the substance is

  1. 630 k J k g to the power of negative 1 end exponent    
  2. 126 k J k g to the power of negative 1 end exponent    
  3. 84 kJ k g to the power of negative 1 end exponent    
  4. 12.6 kJ k g to the power of negative 1 end exponent    

The correct answer is: 84 kJ k g to the power of negative 1 end exponent

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