Given the following AH values, calculate AH for the reaction 6 CO, + 6 H,0 → C,H12O6 + 6 Oz AH; keal'mol kJ³/mol CO, H,O - 304.7 - 94.0 - 68.4 - 1274.9 - 393.3 - 286.2 * AH, is the energy evolved to produce a compound from its elements. *1 kcal is the energy required to raise the temperature of 1000 g of water 1°C. * The joule (J) is a unit of energy that is gradually replacing the calorie (cal) in scientific usage. One calorie is equal to 4.184 joules.

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter13: Chemical Equilibrium
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In the solved Problem 4.1, what is the equation used to solve ΔH of reaction? Why is the heat of reaction endothermic?

Given the following AH values, calculate AH for the reaction
PROBLEM 4.1
6 CO, + 6 H20 –→ CH]½O6 + 6 O;
AH;
kcal/mol
kJ*/mol
- 304.7
- 94.0
- 68.4
- 1274.9
- 393.3
- 286.2
CO,
H,O
* AH, is the energy evolved to produce a compound from its elements.
*1 kcal is the energy required to raise the temperature of 1000 g of water 1°C.
* The joule (J) is a unit of energy that is gradually replacing the
calorie (cal) in scientific usage. One calorie is equal to 4.184 joules.
Solution
The total enthalpy for a reaction is equal to the sum of enthalpy values of the prod-
ucts minus those of the reactants.
6 CO, +
6 H,0
C,H12O6 + 6 0,
- 1274.9 + 6(0)
- 1274.9
6(-393.3) + 6(-286.2)
-2359.8 + (-1717.2)
AH = -1274.9 – (-4077.0) = 2802.1 kJ/mol
The positive AH indicates that the reaction is endothermic.
Transcribed Image Text:Given the following AH values, calculate AH for the reaction PROBLEM 4.1 6 CO, + 6 H20 –→ CH]½O6 + 6 O; AH; kcal/mol kJ*/mol - 304.7 - 94.0 - 68.4 - 1274.9 - 393.3 - 286.2 CO, H,O * AH, is the energy evolved to produce a compound from its elements. *1 kcal is the energy required to raise the temperature of 1000 g of water 1°C. * The joule (J) is a unit of energy that is gradually replacing the calorie (cal) in scientific usage. One calorie is equal to 4.184 joules. Solution The total enthalpy for a reaction is equal to the sum of enthalpy values of the prod- ucts minus those of the reactants. 6 CO, + 6 H,0 C,H12O6 + 6 0, - 1274.9 + 6(0) - 1274.9 6(-393.3) + 6(-286.2) -2359.8 + (-1717.2) AH = -1274.9 – (-4077.0) = 2802.1 kJ/mol The positive AH indicates that the reaction is endothermic.
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