Formation of ozone from oxygen is an endothermic process. In the upper atmosphere, ultraviolet is the source of energy that drives the reaction. Assuming that both the reactions and the products of th

Question

Formation of ozone from oxygen is an endothermic process. In the upper atmosphere, ultraviolet is the source of energy that drives the reaction. Assuming that both the reactions and the products of the reaction are in standard states, the standard enthalpy of formation of ozone from the following information: 3$O_2$(g) -> 2$O_3$(g), δ H° = 286 kJ, is

Prashant Kotian · Accepted Answer

Correct answer: A. The given reaction for the formation of 2 moles of ozone is: 3(g) -> 2(g), δ H° = +286 kJ. The standard enthalpy of formation is defined as the enthalpy change for the formation of exactly 1 mole of the compound from its constituent elements in their standard states. Thus, delta_f H°() = +286 kJ / 2 = +143 kJ/mol.

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