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15a. Using standard heats of formation, calculate the standard enthalpy change for the following reaction. Fe 2 O 3 (s) + 3H 2 (g) --->

15a. Using standard heats of formation, calculate the standard enthalpy change for the following reaction. Fe₂O₃(s) + 3H₂(g) ---> 2Fe(s) + 3H₂O(g)

______ kJ

15b. Using standard heats of formation, calculate the standard enthalpy change for the following reaction. 2H₂(g) + O₂(g) ---> 2H₂O(g)

______ kJ

15c. Using standard heats of formation, calculate the standard enthalpy change for the following reaction. NH₄NO₃(aq) ---> N₂O(g) + 2H₂O(l)

______ kJ

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