Enthalpies of formation of CCl 4 ( g ) , H 2 O ( g ) , CO 2 ( g ) and HCl ( g ) are -105, -242, -394 and -92 kJ mol - 1 respectively. The magnitude of enthalpy of the reaction given below is _________ kJ mol - 1 . (Nearest Integer)

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Solution

Q.
Enthalpies of formation of ${CCl}_{4} (g)$ , $H_{2} O (g)$ , ${CO}_{2} (g)$ and $HCl (g)$ are -105, -242, -394 and -92 kJ ${mol}^{- 1}$ respectively. The magnitude of enthalpy of the reaction given below is _________ kJ ${mol}^{- 1}$ . (Nearest Integer)

${CCl}_{4} (g) + 2 H_{2} O (g) \to {CO}_{2} (g) + 4 HCl (g)$ [2023]

Ans.
(173)

$Δ H_{f}^{\circ} = Δ H_{f}^{\circ} ({CO}_{2}, g) + 4 Δ H_{f}^{\circ} (HCl) - Δ H_{f}^{\circ} ({CCl}_{4}) - 2 Δ H_{f}^{\circ} (H_{2} O, r)$

$= [- 394] + 4 [- 92] + 105 - 2 \times [- 242]$

$= - 394 - 368 + 105 + 484$

$= - 173 kJ/mol$

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