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If it is not in standard state, the values of deltaH differ because the temperature it is carried out at is not the temperature at which deltaH was measured. Therefore, the problem must be done in parts, separating the different temperatures and then combining all the values from each separate calculation for overall enthalpy. In the book. it gives the example of vaporizing water at 25 Celcius. First, heat the liquid to its normal boiling point at 100 Celcius, then allow it to vaporize, then cool the vapor back to 25 Celcius. Each stage occurs at a different temperature and must be separated.
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