Question

Consider the combustion of methane (as represented by the following equation). This is the reaction that occurs for a Bunsen burner, which is a source of heat for chemical reactions in the laboratory.
CH4(g) + 2O2(g) →CO2(g) + 2H2O(g)

For the system at chemical equilibrium, which of the following explains what happens if the temperature is raised?

a. The equilibrium is shifted to the right and the value of K increases.
b. The equilibrium is shifted to the right and the value of K decreases.
c. The equilibrium is shifted to the left and the value of K decreases.
d. The equilibrium is shifted to the left and the value of K increases.
e. The equilibrium is shifted but the value of K stays constant.

Answer 1

Answer:

The correct answer is - option C. The equilibrium is shifted to the left and the value of K decreases.

Explanation:

The combustion of the methane produces water vapor, carbon dioxide when burns in presence of oxygen. This reaction also releases heat and light when combustion occurs.

CH4(g) +2O2(g)-----> CO2(g)+ 2H2O(g) + Heat

As this reaction releases the heat which means it is an exothermic reaction and as if the temperature increase, the equilibrium constant decreases, and as it decreases the equilibrium shifted to the left.

Thus, the correct answer is - option C.