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Heat of Reaction

The Δ Hof f...

Question

The $Δ H_{f}^{o}$ for $C O_{2 (g)}$ , $C O_{(g)}$ and $H_{2} O_{(g)}$ are $- 393.5$ , $- 110.5$ and $- 241.8$ KJ $m o l^{- 1}$ respectively the standard enthalpy change (in KJ) for the reaction $C O_{2 (g)} + H_{2 (g)} \to C O_{(g)} + H_{2} O_{(g)}$ is:

524.1

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41.2

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- 262.5

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- 41.2

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Solution

The correct option is C $41.2$
$C + O_{2} \to C O_{2} Δ H_{f}^{\circ} = - 393.5 k J m o l^{- 1}$
$C + \frac{1}{2} O_{2} \to C O Δ H_{f}^{\circ} = - 110.5 k J m o l^{- 1}$
$H_{2} + \frac{1}{2} O_{2} \to H_{2} O Δ H_{f}^{\circ} = - 241.8 k J m o l^{- 1}$
$C O_{2} \to C + O_{2}$ $Δ H_{f}^{\circ} = + 393.5 k J m o l^{- 1}$
$C + \frac{1}{2} O_{2} \to C O$ $Δ H_{f}^{\circ} = - 110.5 k J m o l^{- 1}$
$H_{2} + \frac{1}{2} O_{2} \to H_{2} O$ $Δ H_{f}^{\circ} = - 241.8 k J m o l^{- 1}$
$c O_{2} + H_{2} \to C O + H_{2} O$
$Δ H = + 393.5 - 110.5 - 241.8$
$= 41.2 k J m o l^{- 1}$

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Similar questions

The $Δ H_{f}^{\circ}$ for $C O_{2} (g), C O (g)$ and $H_{2} O (g)$ are $- 393.5, - 110.5$ and $- 241.8 k J m o l e^{- 1}$ respectively. The standard enthalpy change in kJ for the reaction $C O_{2} (g) + H_{2} (g) \to C O (g) + H_{2} O (g)$ is

Q. The

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C O_{2} (g), C O (g) a n d H_{2} O (g)

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are –393.5, –110.5 and –241.8 kJ

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respectively. The standard enthalpy change (in kJ) for the reaction

C O_{2} + H_{2} \to C O + H_{2} O

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and

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are

- 393.5, - 110.5

and

- 241.8 k J m o l^{- 1}

respectively the standard enthalpy change (in

K J

) for the reaction

C O_{2 (g)} + H_{2 (g)} \to C O_{(g)} + H_{2} O_{(g)}

is:

Q. Given

Δ H_{f}^{o}

for

C O_{2 (g)}, C O_{(g)}

and

H_{2} O_{(g)}

are

- 393.5, - 110.5

and

- 241.8

k J . m o l^{- 1}

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Δ H_{f}^{o}

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k J . m o l^{- 1}

] for the reaction,

C O_{2 (g)} + H_{2 (g)} \to C O_{(g)} + H_{2} O_{(g)}

is?

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The ΔHof for CO2(g), CO(g) and H2O(g) are −393.5, −110.5 and −241.8 KJ mol−1 respectively the standard enthalpy change (in KJ) for the reaction CO2(g)+H2(g)→CO(g)+H2O(g) is:

The $Δ H_{f}^{o}$ for $C O_{2 (g)}$ , $C O_{(g)}$ and $H_{2} O_{(g)}$ are $- 393.5$ , $- 110.5$ and $- 241.8$ KJ $m o l^{- 1}$ respectively the standard enthalpy change (in KJ) for the reaction $C O_{2 (g)} + H_{2 (g)} \to C O_{(g)} + H_{2} O_{(g)}$ is: