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Heat of Formation

If S + O2⟶ ...

Question

If $S + O_{2} ⟶ S O_{2}; Δ H = - 298.2 k J$
$S O_{2} + 1 / 2 O_{2} ⟶ S O_{3}; Δ H = - 98.7 k J$
$S O_{3} + H_{2} O ⟶ H_{2} S O_{4}; Δ H = - 130.2 k J$
$H_{2} + 1 / 2 O_{2} ⟶ H_{2} O; Δ H = - 287.3 k J$
Then the enthalpy of formation of $H_{2} S O_{4} a t 298 K$ is :

A

- 814.4 k J

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B

- 650.3 k J

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C

- 320.5 k J

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D

- 233.5 k J

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Solution

The correct option is A $- 814.4 k J$
According to Hess law,
enthalpy of formation of $H_{2} S O_{4} a t 298 K$ is sum of all
$S + O_{2} ⟶ S O_{2}; Δ H = - 298.2 k J$

$S O_{2} + 1 / 2 O_{2} ⟶ S O_{3}; Δ H = - 98.7 k J$

$S O_{3} + H_{2} O ⟶ H_{2} S O_{4}; Δ H = - 130.2 k J$
$H_{2} + 1 / 2 O_{2} ⟶ H_{2} O; Δ H = - 287.3 k J$
$Δ H$ = $- 298.2 - 98.7 - 130.2 - 287.3 =$ $- 814.4 k J$

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Similar questions

S + O_{2} \to S O_{2}; Δ H = - 298.2 k J

S O_{2} + \frac{1}{2} O_{2} \to S O_{3}; Δ H = - 98.7 k J

S O_{3} + H_{2} O \to H_{2} S O_{4}; Δ H = - 130.2 k J

H_{2} + \frac{1}{2} O_{2} \to H_{2} O; Δ H = - 227.3 k J

the enthalpy of formation of

H_{2} S O_{4}

298

S + O_{2} ⟶ S O_{2}

Δ H = - 398.2 k J

S O_{2} + \frac{1}{2} O_{2} ⟶ S O_{3}

Δ H = - 98.7 k J

S O_{3} + H_{2} O ⟶ H_{2} S O_{4}

Δ H = - 130.2 k J

H_{2} + \frac{1}{2} O_{2} ⟶ H_{2} O

Δ H = - 227.3 k J

The enthalpy of formation of sulphuric acid at

298 K

S + O_{2} \to S O_{2}; Δ H = - 398.2 k J; S O_{2} + \frac{1}{2} O_{2} \to S O_{3}; Δ H = - 98.7 k J

S O_{2} + H_{2} O \to H_{2} S O_{4}; Δ H = - 130.2 k J; H_{2} + \frac{1}{2} O_{2} \to H_{2} O; Δ H = - 227.3 k J

The enthalpy of formation of sulphuric acid at

298

S + O_{2} \to {S O}_{2}; Δ H = - 298.2 k J

{S O}_{2} + \frac{1}{2} O_{2} \to S O_{3}; Δ H = - 98.7 k J

{S O}_{3} + H_{2} O \to H_{2} {S O}_{4}; Δ H = - 130.2 k J

H_{2} + \frac{1}{2} O_{2} \to H_{2} O; Δ H = - 227.3 k J

The heat of formation of

H_{2} {S O}_{4}

S + O_{2} \to S O_{2}

Δ H = - 298.2

S O_{2} + \frac{1}{2} O_{2} \to S O_{3}

Δ H = - 98.7

S O_{3} + H_{2} O \to H_{2} S O_{4}

Δ H = - 130.2

H_{2} + \frac{1}{2} O_{2} \to H_{2} O

Δ H = - 287.3

Then the enthalpy of formation of

H_{2} S O_{4}

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