OnlineCBT
Chemistry · THERMODYNAMICS
हिन्दीGiven the thermochemical reaction: \( \text{C}(\text{graphite}, s) + 2\text{S}(l) \rightarrow \text{CS}_2(l) \); \( \Delta_r H^\ominus = +128.5\text{ kJ mol}^{-1} \). What quantity of heat is absorbed when \( 38\text{ g} \) of carbon disulfide is synthesized from graphite and liquid sulfur?
Correct answer · Option 3
\( 64.25\text{ kJ} \)
Explanation
Molar mass of \( \text{CS}_2 = 12 + 2(32) = 76\text{ g mol}^{-1} \). Moles = \( \frac{38}{76} = 0.5\text{ mol} \). Heat absorbed = \( 0.5 \times 128.5 = 64.25\text{ kJ} \).
