1. Given the following reactions and data, use addition (similar to Hess's Law) to calculate AG° for H3PO4 (s). (Hint: The overall reaction is for the formation of 1 mol of H3PO4 (s) from elements in their natural state (elemental phosphorus is P4 (s)). PA () + 5 02@ → P,O10 (5) AG; - 2698 kJ P,O10 (9) + 6 H0 m → 4 H3P04 () H2 ( + ½ 02 (2) → H;O @ AG° = – 396 kJ - 228.6 kJ AG; : AG vap H,O 0 → H2O @ 8.6 kJ Required work: * rewrite the reactions above in the correct direction, using multipliers to change coefficients and modify AG° values if necessary * show that after cancelling, the sum of your reactions gives the desired overall reaction Write the goal equation first?

Chemistry: Principles and Reactions
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Chapter8: Thermochemistry
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1. Given the following reactions and data, use addition (similar to Hess's Law) to
calculate AG° for H3PO4 (s). (Hint: The overall reaction is for the formation of 1
mol of H3PO4 (s) from elements in their natural state (elemental phosphorus is P4
(s)).
PA () + 5 02@ → P,O10 (5)
AG;
- 2698 kJ
P,O10 (9) + 6 H0 m → 4 H3P04 ()
H2 ( + ½ 02 (2) → H;O @
AG° = – 396 kJ
- 228.6 kJ
AG; :
AG vap
H,O 0 → H2O @
8.6 kJ
Required work:
* rewrite the reactions above in the correct direction, using multipliers to change coefficients
and modify AG° values if necessary
* show that after cancelling, the sum of your reactions gives the desired overall reaction
Write the goal equation first?
Transcribed Image Text:1. Given the following reactions and data, use addition (similar to Hess's Law) to calculate AG° for H3PO4 (s). (Hint: The overall reaction is for the formation of 1 mol of H3PO4 (s) from elements in their natural state (elemental phosphorus is P4 (s)). PA () + 5 02@ → P,O10 (5) AG; - 2698 kJ P,O10 (9) + 6 H0 m → 4 H3P04 () H2 ( + ½ 02 (2) → H;O @ AG° = – 396 kJ - 228.6 kJ AG; : AG vap H,O 0 → H2O @ 8.6 kJ Required work: * rewrite the reactions above in the correct direction, using multipliers to change coefficients and modify AG° values if necessary * show that after cancelling, the sum of your reactions gives the desired overall reaction Write the goal equation first?
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