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Q.

What would be the heat released when an aqueous solution containing 0.5 mole of HNO3 is mixed with 0.3mol of OH− (Enthalpy of neutralization = - 57.1 kJ) ?

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a

1.7 kJ

b

28.5 kJ

c

17.13 kJ

d

45.7 kJ

answer is B.

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Detailed Solution

  • The enthalpy of neutralization is −57.1 kJ/mol.
  • 0.3 mole of HNO3​ will react with 0.3 moles of OH−. 
  • H+ + OH− ⟶ H2​O
  • ∴ Heat evolved = 0.3 x 57.1 kJ = 17.13 kJ.
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