The Reaction Quotient Video Lessons

Example

# Problem: The reaction 2 A → B + C has a Kc of 0.2. The reaction is commenced with initial concentrations [A] = 0.2 M, [B] = 0.2 M and [C] = 0.2 M. In what direction does the reaction occur? 1. Cannot be determined without knowing the temperature. 2. The reaction shifts to the right to reach equilibrium 3. The reaction is already at equilibrium 4. The reaction shifts to the left to reach equilibrium.

###### Problem Details

The reaction 2 A → B + C has a Kc of 0.2. The reaction is commenced with initial concentrations [A] = 0.2 M, [B] = 0.2 M and [C] = 0.2 M. In what direction does the reaction occur?

1. Cannot be determined without knowing the temperature.

2. The reaction shifts to the right to reach equilibrium

3. The reaction is already at equilibrium

4. The reaction shifts to the left to reach equilibrium.

What scientific concept do you need to know in order to solve this problem?

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Based on our data, we think this problem is relevant for Professor Lin's class at UCLA.