What is the quantity of heat evolved when $6 \mathrm{~g}$ carbon combines with sulphur to form…

What is the quantity of heat evolved when $6 \mathrm{~g}$ carbon combines with sulphur to form $\mathrm{CS}_{2}$ according to the reaction $\mathrm{C}+\mathrm{S}_{2} \rightarrow \mathrm{CS}_{2} \quad \Delta \mathrm{H}=-92 \mathrm{KJ} \mathrm{mol}^{-1}$
  1. $22 \mathrm{KJ}$
  2. $32 \mathrm{KJ}$
  3. $46 \mathrm{KJ}$
  4. $11 \mathrm{KJ}$

Solution

$\mathrm{C}+\mathrm{S}_{2} \longrightarrow \mathrm{CS}_{2}$ $\Delta \mathrm{H}=-92 \mathrm{~kJ} \mathrm{~mol}^{-1}$ (Endothermic reaction) For $12 \mathrm{~g} \mathrm{C}$, heat evolved $=92 \mathrm{~kJ}$ $\therefore$ For $6 \mathrm{~g} \mathrm{C}$, heat evolved $=46 \mathrm{~kJ}$

Asked in: MHT CET 2020 (14 Oct Shift 2)

Practice more Thermodynamics (C) questions on Aicharya