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  4. 2.1 g of Fe combines with S evolving 3.77 kJ. The heat of formation of FeS in kJ/mol is

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

Thermodynamics

Solution:

Heat of formation = Energy evolved /mol Number of moles of Fe combining $=\frac{2.1}{56}=0.0375$
So total moles of $FeS$ forming $= 0.0375$
Heat of formation $=\frac{-3.77}{0.0375}=-100.5\,kJ/mol$