CHEM 1050 Chapter Notes - Chapter 6.7, 6.8, 6.9 and 9.11: Triple Bond, Coal Liquefaction, Thermodynamic System

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The enthalpy change for a chemical reaction is independent of the path by which the products are obtained. No matter how you go from given reactants to products, the enthalpy change for the overall chemical change is the same. The enthalpy change for the overall equation equals the sum of the enthalpy changes for the two steps. Useful because it alls you to calculate the enthalpy change for one reaction from the values for others. We generally list enthalpy changes only for certain standard thermodynamic conditions (which are not identical to the standard conditions for gases, stp) Standard state = the standard thermodynamic conditions chosen for substances when listing or comparing thermodynamic data: 1atm pressure and the speci ed temperature (usually 25) The enthalpy change for a reaction in which reactants in their standard states yield products in their standard states is denoted h .

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