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In the reaction 2H2 + O2 -> 2H2O, if the heat liberated is 50 J, what is the heat of formation of H2O?

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In the reaction 2H2 + O2 -> 2H2O, if the heat liberated is 50 J, what is the heat of formation of H2O?

(a) -25 J

(b) 25 J

(c) -50 J

(d) 50 J
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The correct choice is (a) -25 J

Easy explanation: Heat of formation = -50/2 = -25 J.
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