Question

Which compound will absorb the maximum amount of heat when dissolved in the same amount of water ? (Integral heats of solution at 25o C in kcal/mol of each solute are given in brackets)
1. HCl ( delta H = - 17.74 )
2. HNO3 (delta H = - 7.85 )
3. NH4NO3 (delta H = + 16.85 )
4. NaCl (delta H = + 1.02 )

Answer 1

Answer:- 3. NH4NO3 (delta H = + 16.85 ) will absorb the maximum amount of heat when dissolved in the same amount of water. Explanation:- Heat of solution is the enthalpy change associated with the dissolution of a substance in a solvent at constant pressure resulting in infinite dilution.  More positive is the delta H, more is the heat of solution. Thus a compound with more positive delta H will absorb the maximum amount of heat when dissolved in the same amount of water.

Answer 2

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