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In the reaction 2N -> N2, if the heat liberated is 6 J, what is the heat of formation of N2?

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In the reaction 2N -> N2, if the heat liberated is 6 J, what is the heat of formation of N2?

(a) – 6 J

(b) 6 J

(c) 0

(d) Cannot be determined
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The correct choice is (a) – 6 J

To elaborate: Heat of formation = -6 J.
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