What is the heat of formation of HCl_ (g) from following equation? H_ 2(g) + Cl_ 2(g) 2 HCl_ (g) _fH=-194 kJ

MHT CET 2022 Chemistry question

What is the heat of formation of from following equation?

(A)-388 kJ
(B)-97 kJCorrect
(C)-194 kJ
(D)194 kJ

Answer: (B)

Solution

Standard heat (enthalpy) of formation is defined per mole of the compound formed from its elements. The given equation produces 2 mol of HCl with kJ. For 1 mol:

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Question ID VK-096968