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AIIMS2015ChemistryThermodynamics (C)

For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, U and w correspond to

Options

  1. AU < 0, w=0
  2. BU < 0, w < 0
  3. CU>0, w=0
  4. DU>0, w>0

Correct answer

A. U < 0, w=0

Step-by-step solution

Bomb calorimeter commonly used to find the heat of combustion of organic substances, consists of a sealed combustion chamber, called a bomb. The reaction in a bomb calorimeter proceeds at constant volume so, w=0 and U=q . Hence, U < 0, w=0 .

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