# A Level Chemistry 2017 Paper 1 Question 14 Solution - Exclusive

In this exclusive video we want to discuss the suggested solution for A Levels Chemistry (H2 Chemistry) 2017 Paper 1 Question 14.

Let's take a look at this question:

The topic tested in this question is on Chemical Equilibria. In particular the relationship between standard Gibbs free energy and equilibrium constant K given by the expression:

First we need to write out the K expression from the balanced equation.

Equimolar amounts of reactants H_{2}O and CO are used and the mole ratio of reactants and products are all the same.

This means the concentration of reactants H_{2}O and CO will remain the same, and the concentration of products H_{2} and CO_{2} will remain the same as well.

We need to determine when would concentration of product H_{2} be greater than concentration of reactant H_{2}O. This means that K must be greater than 1.

We can substitute K > 1 back into the Gibbs free energy expression and deduce that standard Gibbs free energy must be negative.

We can then look back at the graph to determine that points 3 and 4 are at negative standard Gibbs free energy. So the answer to this question has to be D.

Check out this video for the full solution and detailed calculation!

Topic: Chemical Equilibria, Physical Chemistry, A Level Chemistry, Singapore

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