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Standard XI
Chemistry
Enthalpy Change of a Reaction
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:
$$3O_{2} (g) \rightarrow 2O_{3} (g), \triangle H^{o} = 286\ kJ$$, is

A
$$+143\ kJ/mol$$
B
$$+286\ kJ/mol$$
C
$$-143\ kJ/mol$$
D
$$-286\ kJ/mol$$
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Solution
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Correct option is A. $$+143\ kJ/mol$$

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