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Heat of Formation

Enthalpy chan...

Question

Enthalpy change for the reaction,
$\frac{1}{2} H_{2} (g) + \frac{1}{2} C l_{2} (g) \to H C l (g)$ is called

A

Enthalpy of combustion

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B

Enthalpy of sublimation

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C

Enthalpy of formation

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D

Enthalpy of fusion

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Solution

The correct option is C Enthalpy of formation
The standard enthalpy of formation of a compound is the change of enthalpy during the formation of 1 mole of the substance from its constituent elements with all substances in their standard states.

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Similar questions

Q. Enthalpy change for the reaction,

\frac{1}{2} H_{2} (g) + \frac{1}{2} C l_{2} (g) \to H C l (g)

Q. The enthalpy changes of the following reactions at

27^{\circ} C

$N a (s) + \frac{1}{2} C l_{2} (g) \to N a C l (s)$	$Δ_{r} H = - 411 k J / m o l$
$H_{2} (g) + S (s) + 2 O_{2} (g) \to H_{2} S O_{4} (l)$	$Δ_{r} H = - 811 k J / m o l$
$2 N a (s) + S (s) + 2 O_{2} (g) \to N a_{2} S O_{4} (s)$	$Δ_{r} H = - 1382 k J / m o l$
$\frac{1}{2} H_{2} (g) + \frac{1}{2} C l_{2} (g) \to H C l (g)$	$Δ_{r} H = - 92 k J / m o l;$

from these data, the heat change of reaction at constant volume (in kJ/mol) at

27^{\circ} C

for the process

2 N a C l (s) + H_{2} S O_{4} (l) \to N a_{2} S O_{4} (s) + 2 H C l (g)

{Δ H}_{f}^{o}

for chloride ion from the following data:

\frac{1}{2} H_{2} (g) + \frac{1}{2} {C l}_{2} (g ⟶ H C l (g); Δ H = - 92.4 k J {m o l}^{- 1}

H C l (g) + n H_{2} O ⟶ H^{+} (a q .) + {C l}^{-} (a q .); Δ H = - 74.8 k J {m o l}^{- 1}

Δ H_{f (H^{+} (a q .)}^{o} = 0.0 k J {m o l}^{- 1}

Δ H_{f}^{o}

for chloride ion from the following data:

\frac{1}{2} H_{2} (g) + \frac{1}{2} C l_{2} (g) \to H C l (g)

Δ H = - 92.4

H C l (g) + N H_{2} O

\to H^{+} (a q) + C l^{-} (a q)

Δ H = - 74.8

Δ H_{f}^{o} (H^{+} (a q)) = 0.0

△ H_{f}^{\circ}

for chloride ion from the following data :

\frac{1}{2} H_{2} (g) + \frac{1}{2} C l_{2} (g) \to H C l (g); △ H_{f}^{\circ} = - 92.4 k J

H C l (g) + n H_{2} O \to H^{+} (a q) + C l^{-} (a q); △ H^{\circ} = - 74.8 k J

△ H_{f}^{\circ} H^{+} (a q) = 0.0 k J

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Heat of Formation

Standard XII Chemistry

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