Experiment%208%20Notes

Experiment%208%20Notes - rxn1 . A B H rxn1 C D H rxn2 A + C...

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Chem. 117 Experiment #8 Chp. 9.4 - 9.6 (1) Mg(s) + ½O 2 (g) MgO(s) Experimental Objective: Indirect determination H rxn(1) (2) Mg(s) + 2HCl(aq) MgCl 2 (s) + H 2 (g) (3) MgO(s) + 2HCl(aq) MgCl 2 (s) + H 2 O(l) Determine H rxn(2) ( Part B ) Determine H rxn(3) ( Part C ) (4) H 2 (g) + ½ O 2 (g) H 2 O(l) H rxn(4) = -285.8 kJ/mol
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Chem. 117 Experiment #8 Chp. 9.4 - 9.6 Hess’s Law - if a reaction is carried out in a series of steps, H rxn for the overall reaction will be equal to the sum of the heats of reaction for the individual steps. Heats of reaction are extensive properties A B H rxn1 2A 2B 2H rxn1 H rxn for a reaction in the forward direction is equal in size, but opposite in sign, to H rxn for the reverse reaction. A B H rxn1 B A -H rxn1 In experiment 8 you will combine H rxn2 , H rxn3 , and H rxn4 to calculate H
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Unformatted text preview: rxn1 . A B H rxn1 C D H rxn2 A + C B +D H rxn1 + H rxn2 Heats of reaction will be determined calorimetrically The heat given off by the reaction is absorbed by the calorimeter and the aqueous solution.-H rxn = q solution + q calorimeter Calculating the heat absorbed by the calorimeter is requires a calorimeter constant, C c . The calorimeter constant is determined in Part A . q calorimeter = C c ( T) The heat absorbed by the aqueous solution can be calculated from data collected in Parts B and C . q solution = mC H2O ( T) = (m acid + m Mg,MgO )C H2O ( T) Chem. 117 Experiment #8 Chp. 9.4 - 9.6-H rxn = q solution + q calorimeter = (m acid + m Mg,MgO )C H2O ( T) + C c ( T)...
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This note was uploaded on 02/23/2010 for the course CHEM 107 taught by Professor Generalchemforeng during the Fall '07 term at Texas A&M.

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Experiment%208%20Notes - rxn1 . A B H rxn1 C D H rxn2 A + C...

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