CHEM 1LC Study Guide - Final Guide: Enthalpy, Reagent, Thermodynamics
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9 Mar 2019
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Chemical energy is released or absorbed from reactions in various forms. The most easily measurable form of energy comes in the form of heat, or enthalpy. The enthalpy of a reaction can be calculated from the heats of formation of the substances involved in the reaction:
?H?rxn=? np?H?f(products)?? nr?H?f(reactants)
where n represents the stoichiometric coefficients.
Calculate the standard enthalpy change for the reaction
2A+B?2C+2D
Use the following data:
Substance | ?H?f (kJ/mol) |
A | -247 |
B | -413 |
C | 213 |
D | -475 |
?H?rxn =