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At 25^(@)C, the following heat of format...

At `25^(@)C`, the following heat of formations are given:
`{:("Compound",SO_(2)(g),H_(2)O(l),,),(Delta_(f)H^(Theta)kJmol^(-1),-296.0,-285.0,,):}`
For the reactions at `25^(@)C`,
`2H_(2)S(g) +Fe(s) rarr FeS_(2)(s) +2H_(2)(g), DeltaH^(Theta) =- 137 kJ mool^(-1)`
`H_(2)S(g) +(3)/(2)O_(2)(g) rarr H_(2)O(l) +So_(2)(g),DeltaH^(Theta) =- 562kJ mol^(-1)`
Calculate the heat of formation of `H_(2)S(g)` and `FeS_(2)(g)` at `25^(@)C`.

Text Solution

Verified by Experts

The correct Answer is:
`DeltaH=-72` kJ/mole
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