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Percent error is used when you are comparing your result to a known  or accepted value. It is the absolute value of the difference of  the values divided by the accepted valâ¦ue, and written as a  percentage. Percent error is equal to the difference divided by the  known times 100 percent.
5. Determine the heat of formation, Î´H f, for MgO. ERROR ANALYSIS 1. Compare your experimentally obtained value for Î´H f (MgO) to the true value in your textbook by calculating the percent error: % error = (|true value â expt value| / true value) x 100 2.ccording to the First Law of Thermodynamics, the enthalpy of a reaction is the difference between the enthalpy of the products and the enthalpy of the reactants. Since enthalpy is a state function, the enthalpy change is the same whether the reaction takes place in one step or in a series of steps.