Calculating K from Initial and Equilibrium ConcentrationsA

Chapter , Problem 1PE

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Problem 1PE

Calculating K from Initial and Equilibrium Concentrations

A closed system initially containing 1.000 * 10-3 M H2 and 2.000 * 10-3 M\2 at 448 °C is allowed to reach equilibrium, and at equilibrium the HI concentration is 1.87 * 10-3 M. Calculate Kc at 448 °C for the reaction taking place, which is

H2(g) + \2(g) * 2 Hl(g)

Practice Exercise 1

In Section, we discussed the equilibrium between N204(g) and N02(g). Let’s return to that equation in a quantitative example. When 9.2 g of frozen N204 is added to a 0.50 L reaction vessel and the vessel is heated to 400 K and allowed to come to equilbirum, the concentration of N204 is determined to be 0.057 M. Given this information, what is the value of Kc for the reaction N204(g)— N02(g) at 400 K?

(a) 0.23, (b) 0.36. (c) 0.13. (d) 1.4, (e) 2.5.