Explanation Given: Volume percent of nitrogen ( V N 2 ) is 78 % = 78 L . Volume percent of oxygen ( V O 2 ) is 21 % = 21 L . Equilibrium constant K p is 4.1 × 10 − 31 . Pressure of the gas ( P ) is 1 atm . Temperature ( T ) is 298 K . Ideal gas constant ( R ) is 0.0821 L atm/(mol K) . Equilibrium constant for the given reaction K p is 4.1 × 10 − 31 . Explanation: Assume the total volume ( V ) to be 100 L . Calculate the number of moles of nitrogen ( n N 2 ) as follows. According to ideal gas equation, P V N 2 = n N 2 R T Substitute 1 atm for P , 78 L for V N 2 , 298 K for T , 0.0821 L atm/(mol K) for R : 1 atm × 78 L = n N 2 × 0.0821 L atm/(mol K × 298 K n N 2 = 3.188 mol So, the number of moles of nitrogen is 3.188 mol . Concentration of nitrogen is equal to the ratio of number of moles of nitrogen and total volume of air: C N 2 = n N 2 V Substitute 3.188 mol for n N 2 and 100 L for V : C N 2 = 3.188 mol 100 L = 0.032 M So, the concentration of nitrogen is 0.032 M . Calculate the number of moles of oxygen ( n O 2 ) as follows: According to ideal gas equation, P V O 2 = n O 2 R T Substitute 1 atm for P , 21 L for V N 2 , 298 K for T , 0.0821 L atm/(mol K) for R : 1 atm × 21 L = n N 2 × 0.0821 L atm/(mol K) × 298 K n O 2 = 0.858 mol So, the number of moles of oxygen is 0

Mastering Chemistry with Pearson eText -- Standalone Access Card -- for Chemistry: A Molecular Approach (4th Edition)

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ISBN: 9780134162485

Author: Nivaldo J. Tro

Publisher: PEARSON

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Chapter 15, Problem 74E

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To determine: Concentration of N2 and O2, and equilibrium concentration of NO.

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Chapter 15, Problem 73E

Chapter 15, Problem 75E

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Mastering Chemistry with Pearson eText -- Standalone Access Card -- for Chemistry: A Molecular Approach (4th Edition)

Ch. 15 - Prob. 1SAQ Ch. 15 - Q2. The equilibrium constant for the reaction...Ch. 15 - Q3. Use the data shown here to find the...Ch. 15 - Prob. 4SAQ Ch. 15 - Prob. 5SAQ Ch. 15 - Q6. For the reaction 2 A(g) B(g), the equilibrium...Ch. 15 - Q7. Consider the reaction between iodine gas and...Ch. 15 - Prob. 8SAQ Ch. 15 - Prob. 9SAQ Ch. 15 - Prob. 10SAQ

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Concentration of N 2 and O 2 , and equilibrium concentration of NO .

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To determine: Concentration of N2 and O2, and equilibrium concentration of NO.

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