Chem_126_2008_Common_3_11zqq

Chem_126_2008_Common_3_11zqq - Chem 126 Common 3 Part I...

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Chem 126 Common 3 Part I April, 18, 2008 1. The Haber process is at equilibrium at 700 K with some nitrogen, hydrogen, and ammonia: Which of the following conditions DOES NOT increase the equilibrium amount of ammonia? (a) The addition of nitrogen (b) The addition of hydrogen (c) Increasing the pressure by reducing the volume (d) Increasing the temperature (e) Decreasing the temperature 2. For which of the following processes is the change in internal energy, Δ E, 0? (a) Steam at 100 ºC is converted to water at 100 ºC. (b) An aluminum bar melts at 650 ºC. (c) A gas expands adiabatically (q = 0) against a pressure of 1 atm. (d) The heat added at constant volume (q v ) is 0. (e) The heat added at constant pressure (q p ) is 0. 3. What is the change in Δ E, when 4400 J of heat is added and the system expands from 5.0 to 25.0 L against an external pressure of 0.85 atm. (1 L·atm = 101.3 J) (a) 4,400 J (b) 2,700 J (c) 6,100 J (d) -2,700 J (e) -6,100 J 4. A process takes place at constant pressure. The volume changes and the temperature decreases by 290 o C. The heat capacity of the system at constant volume, C V , is 315 kJ/ o C and C P , is 325 kJ/ o C. What is Δ E in kJ? (a) 94,000 kJ (b) -94,000 kJ (c) -91,000 kJ (d) -180,000 kJ (e) Insufficient information to determine answer 5. For which of the following reactions is the enthalpy change in the reaction, o rxn H , equal to o f H for NH 3 (g)? (a) 3 3 N H NH + (b) ( 29 ( 29 ( 29 3 3 N g H g NH g + (c) ( 29 ( 29 ( 29 2 2 3 0.5 1.5 N g H g NH g + (d) ( 29 ( 29 ( 29 ( 29 2 2 3 2 0.5 1.5 0 0.750 N g H g NH g g + + (e)
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This note was uploaded on 03/30/2012 for the course CHEM 126 taught by Professor Biolsi during the Spring '08 term at NJIT.

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Chem_126_2008_Common_3_11zqq - Chem 126 Common 3 Part I...

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