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If S +O(2) rarr SO(2), DeltaH =- 298.2 k...

If `S +O_(2) rarr SO_(2), DeltaH =- 298.2 kJ`
`SO_(2)+1//2O_(2) rarr SO_(3), DeltaH =- 98.7 kJ`
`SO_(3)+H_(2)O rarr H_(2)SO_(4), DeltaH =- 130.2 kJ`
`H_(2) +1//2O_(2) rarr H_(2)O, DeltaH =- 287.3 kJ`
Then the enthalpy of formation of `H_(2)SO_(4)` at `298K` is

A

`-814.4` KJ

B

`-650.3` KJ

C

`-320.5` KJ

D

`-433.5` KJ

Text Solution

Verified by Experts

The correct Answer is:
A
`H_(2(g))+S_((s))+2O_(2(g))rarr H_(2)SO_(4) , Delta H_(f) = ?`
Desired equation = eq(i) + eq(iii) + eq(iv) + eq(ii)
`Delta H_(f)=(-298.2)+(-130.2)+(-287.3)+(-98.7)`
`Delta H_(f)=-814.4 KJ`
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Given: (i) S+O_2 to SO_2, Delta H=-298.2 kJ (ii) SO_2 + 1/2 O_2 to SO_3, Delta H=-98.7 kJ (iii) SO_3 + H_2 O to H_2 SO_4, Delta H=-130.2 kJ (iv) H_2 + 1/2 O_2 to H_2 O, Delta H=-287.3 kJ , Then the enthalpy of formation of H_2 SO_4 at 298 K will be _________ .

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ALLEN-THERMODYNAMICS -EXERCISE -3
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  9. If S +O(2) rarr SO(2), DeltaH =- 298.2 kJ SO(2)+1//2O(2) rarr SO(3),...

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