University:
Ohio State University
Course:
CHEM 1210 | General Chemistry I
Academic year:

2021
Views:

306

Pages:

1
Author:

Harriet D.

Lecture 28 Today •Hess's Law and Enthalpies of Formation -Enthalpies of reactions can be treated algebraically, -Enthalpies of formation can be used to calculate the enthalpy of a reaction Enthalpy is a state function we only care about starting and ending values 1) Standard State For a gas the standard state is the For a liquid or solid the standard state for gas al pure gas a liquid or a pressure of exactly I atm Solid is pure substance in its most stable form at a pressure of I atm and at the temperature of Interest (often taken to be 25°c) For a substance in Solution The standard state for Concentration of exactly IM. a substance in Solution is a 2) Standard Enthalpy Change (AH) The change in enthalpy for a process when all reactants and products are in their 3) Standard Enthalpy of formation (AH) from its constituent elements in their standard states For a pune element in its standard state 매우 = 0 Standard states. The degree sign indicates Standard States. •For a pure compound the change in enthalpy when I mol of the compounds forms A Hin - Enpati (products) - En. A Hi (reactants)

Chapter 10 - Temperature & Pressure Note

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