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Practice Problems 1.30.12

# Practice Problems 1.30.12 - kJ mol CO 2(g)=-393.5 kJ mol...

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Susie Lee Practice Problems SI sessions [email protected] Sun 7-8p HECC 202 1/30/12 Mon 7-8p HECC 202 Wed 7-8p HECC 202 1. 2H 2 O(l) 2H 2 (g) + O 2 (g) G o = 476.5 kJ and H o = 571.6 kJ at 291 K and 1 atm. Is this reaction spontaneous at 291 K? Why? What is the entropy change for the reaction at 291 K? When is it spontaneous? 2. 4HCl(g) + O 2 (g) 2H 2 O(g) + 2Cl 2 (g) H o = -114.4 kJ and S o = -128.9 J/K What is the standard free energy change for the reaction at 270 K, 1 atm ? Is this reaction is (reactant or product) favored under standard conditions at 270 K? When is it spontaneous? 3. CaCO 3 (s) CaO(s) + CO 2 (g) Using standard absolute entropies at 298K, calculate the entropy change for the system when 2.01 moles of CaCO 3 (s) react at standard conditions. (CaO(s)= 39.8 J/K mol; CO 2 (g)= 213.7 J/K mol; CaCO 3 (s)= 92.9 J/K mol) Using standard thermodynamic data at 298K, calculate the entropy change for the surroundings when 1.98 moles of CaCO 3 (s) react at standard conditions. (CaO(s)= -635.1

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Unformatted text preview: kJ/ mol; CO 2 (g)= -393.5 kJ/ mol; CaCO 3 (s)= -1206.9 kJ/ mol) Susie Lee Practice Problems SI sessions [email protected] Sun 7-8p HECC 202 1/30/12 Mon 7-8p HECC 202 Wed 7-8p HECC 202 4. The nonvolatile, nonelectrolyte saccharin , C 7 H 5 NO 3 S (183.20 g/mol), is soluble in ethanol CH 3 CH 2 OH. 13.7 grams of saccharin are dissolved in 173 ml of an ethanol solution at 298 K. What is the concentration of the solution? What is the osmotic pressure? 5. 14.49 grams of a compound were dissolved to make 262.7 mL of a chloroform solution, the osmotic pressure generated was 4.95 atm at 298 K. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight of the compound? 6. 12.29 grams of ammonium phosphate, (149.1 g/mol), are dissolved in 254.2 grams of water. What is the concentration of the solution. What is the boiling point of the solution?...
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