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

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
$\underset{{{S}^{o}}(298\,K)\,{{K}^{-1}}\,mo{{l}^{-1}}}{\mathop{{{H}^{+}}(aq)}}\,+\underset{-10.7}{\mathop{O{{H}^{-}}(aq)}}\,\xrightarrow{{}}\underset{+70}{\mathop{{{H}_{2}}O(l)}}\,$

Standard entropy change for the above reaction is .....$J\,{K^{ - 1}}\,mo{l^{ - 1}}$

  • A
    $60.3$
  • ✓
    $80.7$
  • C
    $ - 70$
  • D
    $ + 10.7$
✓

Answer

Correct option: B.
$80.7$
(b)$\mathop {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{H^ + }_{(aq)}}\limits_{{S^o}(298\,K)\,{K^ - }\,mo{l^{ - 1}}} + \mathop {O{H^ - }_{(aq)}}\limits_{ - 10.7} \to \mathop {{H_2}{O_{(l)}}}\limits_{ + 70} $
$\Delta {S^o}(298\,K) = \Delta {S_P} - \Delta {S_R}$$ = 70 - ( - 10.7 + 0)$
$80.7\,J{K^{ - 1}}\,mo{l^{ - 1}}$

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