Learning Goal: To understand how to use Hess's law to find the enthalpy of an overall reaction. Constacta Pans Tatde Part C The change in enthalpy, AH, is the heat absorbed or produced during any reaction at constant pressure. Hess's law states that AH for an overall reaction is the sum of the AH values for the individual reactions. For example, if we wanted to know the enthalpy change for the reaction What is the enthalpy for the following reaction? overall: C2 H4 + H20-C2H;OH Express your answer numerically in kilojoules per mole. 3Mn +302-3MNO2 • View Available Hint(s) we could calculate it using the enthalpy values for the following individual steps: να ΑΣφ Step 1: 4Al + 302-2Al,O3 AH = kJ/mol Step 2: 3Mn + 2Al2O3+3MnO2 +4A1 Overall: 3Mn + 302-3MNO2 Submit Previous Answers 3352 kJ/mol for step If the enthalpy change is 1 and 1792 kJ/mol for step 2, then the enthalpy change for the overall reaction is calculated as follows: X Incorrect; Try Again; 24 attempts remaining ΔΗ- -3352+ 1792 = -1560 kJ/mol Next> Provide Feedback It is also important to note that the change in enthalpy is a state function, meaning it is P Pearson Copyright © 2021 Pearson Education Inc. All rights reserved. Terms of Use | Privacy Policy | Permissions | Contact US 901 39

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