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Olympiad workbook

Exam: Olympiad workbook
Subject: NSEC
Chapter: Thermodynamics (C)

Olympiad workbook · NSEC · Thermodynamics (C)

The lattice enthalpy and enthalpy of solution in water for solid...

The lattice enthalpy and enthalpy of solution in water for solid NaCl are 753 kJ

\mathrm{mol}^{-1}

and

5 \mathrm{~kJ} \mathrm{~mol}^{-1}

respectively(Fig above). If the solution enthalpies of

\mathrm{Na}^{+}

and

\mathrm{Cl}^{-}

are in the ratio 6:5, the enthalpy of hydration of

\mathrm{Na}^{+}

ion is

Options

A $408 \mathrm{~kJ} \mathrm{~mol}^{-1}$
B $-412 \mathrm{~kJ} \mathrm{~mol}^{-1}$
C $-408 \mathrm{~kJ} \mathrm{~mol}^{-1}$
D $-412 \mathrm{~kJ} \mathrm{~mol}^{-1}$

Correct answer

C. $-408 \mathrm{~kJ} \mathrm{~mol}^{-1}$

Step-by-step solution

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