Calculate the standard enthalpy, entropy, and Gibbs free energy for each of the following reactions at 298 K by using data in Appendix 2A. For each case, confirm that the value obtained from the Gibbs free energies of formation is the same as that obtained by using the relation ΔG° = ΔH° – TΔS°. Which of the reagents in parts (a)–(c) would you expect to be the most effective at removing water from a substance? Explain your reasoning.

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(a) the hydration of copper sulfate: CuSO4(s) + 5 HO(1) CuSO4-5 HO(s) (b) the reaction of phosphorus(V) oxide with water: P4010(s) + 6 HO(1) 4 H3PO4(aq) (c) the reaction of HNO3(1) with water to form aqueous nitric acid: HNO3(1) HNO3(aq)