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5. Thermodynamics and thermochemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
Which of the following compounds will absorb the maximum quantity of heat when dissolved in the same amount of water ? The heats of solution of these compounds at ${25\,^o}C$ in $ kJ/mole$  of each solute is given in brackets
  • A
    $HN{O_3}(\Delta H = - 33)$
  • B
    $KCl(\Delta H = + 17.64)$
  • ✓
    $N{H_4}N{O_3}\,(\Delta H = + 25.5)$
  • D
    $HCl\,(\Delta H = - 74.1)$
✓

Answer

Correct option: C.
$N{H_4}N{O_3}\,(\Delta H = + 25.5)$
(c) More $+ve$ is $\Delta {H_s}$ more is heat of solution.

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