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Enthalpy of formation


OFX2(g)+HX2O(g)OX2(g)+2HF(g)\ce{OF2}(g) + \ce{H2O}(g) \rightarrow \ce{O2}(g) + \ce{2HF}(g)
The standard enthalpy change for the reaction represented above is delta, H, start subscript, 1, end subscript. The standard enthalpies of formation for HX2O(g)\ce{H2O}(g) and HF(g)\ce{HF}(g) are delta, H, start subscript, 2, end subscript and delta, H, start subscript, 3, end subscript, respectively.
Which of the following expressions is equivalent to the standard enthalpy of formation for OFX2(g)\ce{OF2}(g)?
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