Q.

The heat of neutralization of a strong acid and a strong base (or) alkali is -57.0 kJ/mol. The heat released when 0.5 mole of HNO3 solution is mixed with 0.2 mole of KOH is

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a

57.0 kJ

b

11.4 kJ

c

28.5 kJ

d

34.9 kJ

answer is B.

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Detailed Solution

The heat of neutralization of a strong acid and a strong base (or) alkali is -57.0 kJ/mol. The heat released =?Neutralization Reaction,HNO3+KOH→KNO3+H2OLimiting reagent is KOH.          Only 0.2 moles of each HNO3  and KOH will be neutralized          1 mole of H2O  formation releases 57.0 kJ/mole          0.2 mole of the enthalpy change: =−57.0×0.2∴ΔH=−11.4 kJ/mole.
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