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2.1g of Fe combines with S evolving 3.7...

`2.1g` of `Fe ` combines with `S` evolving `3.77KJ` . The heat of formation of `FeS` in `KJ//mol` is

A

`-3.77`

B

`-1.79`

C

`-100.5`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
`Fe + S rarr FeS`
2.1 g of Fe evolve = 3.77 kJ
Negative sign shows release of energy.
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