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STD 11 - 5. Thermodynamics and thermochemistry — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 5. Thermodynamics and thermochemistry4 Marks
Question
Calculate maximum possible heat which can be released if a $4\ l$ aqueous solution is to be formed by mixing appropriate yolumes of $2\ M\  NaOH$ and $3\ M\  H_2SO_4$ solution $\Delta {H_{{\text{neutralisation}}\,\,{\text{SA/SB}}}} =  - 14\ kcal/mol$ ......$ kcal$
✓

Answer

$2 \mathrm{NaOH}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}+2 \mathrm{H}_{2} \mathrm{O}$

Let volume of $\mathrm{NaOH}$ for complete reaction

$=V-$ $lit$

$\mathrm{re}$ Mole $2 \mathrm{V} \quad \mathrm{V}$

$\Rightarrow \quad V=3(4-V)$

$\Rightarrow \quad V=3 \,\mathrm{L}$

Maximum possible heat reieased $=6 \times 14$

$=84 \,\mathrm{Kcal}$

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