Enthalpy changes that are difficult to measure directly can often be determined using Hess’ Law to construct an enthalpy cycle.
Which enthalpy change is indicated by X in the enthalpy cycle shown?
+1 x Enthalpy of formation of water
-1 x Enthalpy of formation of water
+3 x Enthalpy of formation of water
-3 x Enthalpy of formation of water
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