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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