Sample+Exam+2+Solution

2 n 2 o g n 2 h 4g 3 n 2g 2 h 2 o g a when 010 moles

• Test Prep
• gvgarc018
• 7

This preview shows pages 6–7. Sign up to view the full content.

2 N 2 O (g) + N 2 H 4(g) 3 N 2(g) + 2 H 2 O (g) a) When 0.10 moles of N 2 O and 0.25 moles of N 2 H 4 are placed in a 10.0-L container and allowed to come to equilibrium, the equilibrium concentration of N 2 O is 0.0060 M. What is the equilibrium concentration of all four substances? [N 2 O] = 0.0060 M [N 2 H 4 ] = 0.023 M [N 2 ] = 0.0060 M [H 2 O] = 0.0040 M b) What is the value of the equilibrium constant? K c = 4.2 x 10 -6 2. A mixture of 0.500 M HI, 0.100 M H 2 , and 0.100 M I 2 is placed in a reaction vessel and allowed to come to equilibrium at a temperature of 745 K. The value of the equilibrium constant at that temperature is 0.0200. 2 HI (g) H 2(g) + I 2(g) a) What is the value of the reaction quotient, Q?

This preview has intentionally blurred sections. Sign up to view the full version.

Q = 0. 0400 (too many products, reaction shifts left to attain equilibrium) b) What is the concentration of HI at equilibrium? [HI] = 0.545 M 3. What is the pH of a 0.35 M solution of acetic acid, HC 2 H 3 O 2 ? The K a of acetic acid is 1.8 x 10 -5 . You must write the reaction to obtain full credit. pH = 2.60 4. What is the pH of a 0.050 M NC 5 H 5 solution (K b for NC 5 H 5 is equal to 1.7 x 10 -9 )? You must write the reaction to obtain full credit. pH = 8.96
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern