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Question

You must show work to receive credit for problems which require a calculator, even if it is a multiple choice problem. Each problem has a relative point value as indicated by the number of asterisks M 1. "Determine the value of Ke for the following reaction if the equilibrium concentrations are as follows: [N2)eq-1.5 M [Haleq-1.1 M [NH -0.47 M. N2(g)+3 H(g) 2 NH(g) What isthe value ofKfor the following reaction ifthe value of Ke is determined to be 127 at 25.0°C IO 2 2503 (g) 2SO2 (g) + O2 (g) 3. According to LeChatelier's principle, which change will increase the quantity of product in the 2 SO3 (g) following reaction? 2SO2 (g) + O2 (g) (A) a decrease in temperature (B) an increase in volume of container (C) a decrease in pressure (D) adding a catalyst (E) an increase in temperature "Initially, 0.50 M N 0s is placed in a sealed flask. What is the value of Ke for the reaction given below, if the concentration of NJOs is 0.14 M once the system has reached equilibrium? 2 NO2 (g) kc N:04 (g) :3.7

Explanation / Answer

Ans 1 :

The equillibrium constant Kc for this reaction is given as :

Kc = [NH3]2 / [N2] [H2]3

So putting all the values we get :

Kc = (0.47)2/ (1.5) (1.1)3

= 0.11

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