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

At `25^(@)`C, the following heat of formation is given:
Compound : `SO_(2)(g), H_(2)O(l)`
`DeltaH_(1)^(@) kJ//"mole" : -296.81, -285.83`
For the reactions at `25^(@)`C
`2H_(2)S(g) + Fe(s) to FeS_(2)(s) + 2H_(2)(g), DeltaH^(@) = -137` kJ/mole.
`H_(2)S(g) + 3//2O_(2)(g) to H_(2)O(l) + SO_(2)(g), DeltaH^(@) = -562` kJ/mole.
Calculate heat of formation of `H_(2)S`(g) and `FeS_(2)(s)` at `25^(@)` C.

Text Solution

Verified by Experts

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