CHEM 261 Lecture Notes - Lecture 6: Heat Capacity, Joule, Enthalpy
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18 Oct 2016
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The standard enthalpy of formation (ÎHâf) is the enthalpy change that occurs when exactly 1 mol of a compound is formed from its constituent elements under standard conditions. The standard conditions are 1 atm pressure, a temperature of 25 âC , and all the species present at a concentration of 1 M . A "standard enthalpies of formation table" containing ÎHâf values might look something like this:
Substance | ÎHâf |
H(g) | 218 kJ/mol |
H2(g) | 0 kJ/mol |
Sr(s) | 0 kJ/mol |
Sr2+(aq) | â 549.7 kJ/mol |
C(g) | 71 kJ/mol |
C(s) | 0 kJ/mol |
N(g) | 473 kJ/mol |
O2(g) | 0 kJ/mol |
O(g) | 249 kJ/mol |
S2(g) | 129 kJ/mol |
What is the balanced chemical equation for the reaction used to calculate ÎHâf of SrCO3(s)?