Web_Quiz_2_Key (Chap 13)

# Web_Quiz_2_Key (Chap 13) - Web Quiz 2 with answer

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1 Chapter 13 Web Quiz Worked Solutions 1. A 10.0-g sample of solid NH 4 Cl is heated in a 5.00-L container to 900°C. At equilibrium the pressure of NH 3 ( g ) is 1.20 atm. NH 4 Cl( s ) NH 3 ( g ) + HCl( g ) The equilibrium constant, K p , for the reaction is: A. 1.21 B. 1.44 C. 2.40 D. 31.0 2. A sample of solid NH 4 NO 3 was placed in an evacuated container and then heated so that it decomposed explosively according to the following equation: NH 4 NO 3 ( s ) N 2 O( g ) + 2H 2 O( g ) At equilibrium the total pressure in the container was found to be 3.20 atm at a temperature of 500°C. Calculate K p . A. 4.10 B. 1.23 C. 2.56 D. 4.85 E. 1.14

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2 3. Consider the following equilibrated system: 2NO 2 ( g ) 2NO( g ) + O 2 ( g ). If the K p value is 0.860, find the equilibrium pressure of the O 2 gas if the NO 2 gas pressure is 0.520 atm and the P NO is 0.300 atm at equilibrium. 4. Consider the following reaction: 2HF( g ) H 2 ( g ) + F 2 ( g ) ( K = 1.00 x 10 -2 ) Given 1.00 mole of HF( g ), 0.500 mole of H 2 ( g ), and 0.750 mole of F 2 ( g ) are mixed in a 5.00-L flask, determine the reaction quotient, Q , and the net direction to achieve equilibrium. A. Q = 0.150; the equilibrium shifts to the right. B. Q = 0.375; the equilibrium shifts to the left. C. Q = 0.150; the equilibrium shifts to the left. D. Q = 0.375; the equilibrium shifts to the right. E. Q = 0.150; the system is at equilibrium.
3 5. Nitric oxide, an important pollutant in air, is formed from the elements nitrogen and oxygen at high temperatures, such as those obtained when gasoline burns in an automobile engine. At 2000°C, K for the reaction N 2 ( g ) + O

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Web_Quiz_2_Key (Chap 13) - Web Quiz 2 with answer

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