An equilibrium mixture of CO, O2 and CO2 at a certain temperature contains 0.0010 M CO2 and 0.0100 M O2. At this temperature, Kc equals 1.4 * 102 for the reaction: 2 CO (g) + O2 (g) ⇌2 CO2 (g). What is the equilibrium concentration of CO?

A) 7.1 * 10-7 M.

B) 8.4 * 10-4 M.

C) 1.4 * 10-2 M.

D) 1.2 * 10-1 M.

Question

Naima Walton

Chemistry

12 August, 21:21

An equilibrium mixture of CO, O2 and CO2 at a certain temperature contains 0.0010 M CO2 and 0.0100 M O2. At this temperature, Kc equals 1.4 * 102 for the reaction: 2 CO (g) + O2 (g) ⇌2 CO2 (g). What is the equilibrium concentration of CO?

A) 7.1 * 10-7 M.

B) 8.4 * 10-4 M.

C) 1.4 * 10-2 M.

D) 1.2 * 10-1 M.

+5

Answers (1)

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Williamson · Answer 1

The correct answer to this question is letter "B) 8.4 * 10-4 M."

2CO+O22CO2

-x - x + x

It started as 2CO2 so + x, then it decomposed into 2CO and O2, so-x

2CO-oxidized, O2-Oxidized, 2CO2-reduced

the easiest way is to look at the equation, so if we have some reactant and no product

A2C+D

-x + 2x + x

so if we had product concentration, and no reactant concentration 3A C+D + 3x - x-x