1442test4 - 1442 Review Test 4 Chapters 20 and 21 Website:

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1442 Review Test 4 Chapters 20 and 21 Website: http://dipowell1.home.mindspring.com Equations: ∆H reaction = ∑ H products - ∑ H reactants ( Also works for S and G) ∆G = ∆ H - T∆S ∆G = -RT lnK ( R = 8.314 J/mol.K) ∆G = ∆G o + RT lnQ E cell = E oxidation + E reduction ∆G = -nFE cell ( F = 96,500 C) logK = nE o cell / 0.0592V E cell = E o cell - 0.0592V/n log Q it = nFe i = amps t= seconds n= moles an element e= moles of electrons transferred in the reaction Chapter 20 1. Which of the following is necessary and sufficient to assure that a process is spontaneous? (a) H < 0 (b) S > 0 (c) G < 0 (d) S <0 (e) none 2. The enthalpy change for the following is –891 kJ: CH 4 + 2 O 2 CO 2 + 2 H 2 O What is the enthalpy change associated with the complete combustion of 1.00 g of CH 4 ? 3. In which case will a reaction be spontaneous only at high temperature? (a) H = - S = + (b) H = - , S = - (c) H = + , S = + (d) H = +, S = - 4. Given the reactions: (1) 2 Fe 2 O 3 (s) 4 Fe (s) + 3 O 2 (g) (2) Ag + (aq) + Cl - (aq) AgCl (s) (3) H 2 O (g) H 2 O(l) In which reactions does the entropy decrease? 5. Given the reaction: CaO(s) + SO 3 (g) CaSO 4 (s) for which H = -403.l3 kJ and S = -189.3 J/mole.K. What is the value of G in kJ/mole at 0 o C? 6. For the reaction in equilibrium at 298 K: CaSO 4 (s) + CO 2 (g) ↔ CaCO 3 (s) + SO 3 (g). If G = 217 kJ/mol , what is the value of K? 7.
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1442test4 - 1442 Review Test 4 Chapters 20 and 21 Website:

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