Question

Consider the reaction below. C2H4(g) + H2(g) to C2H6(g) Which change would likely cause the greatest increase in the rate of the reaction?

a decrease temperature and decrease pressure
b increase temperature and decrease pressure
c decrease temperature and increase pressure
d increase temperature and increase pressure

Answer 1

D. Increase temperature and increase pressure

Answer 2

Answer: Option (d) is the correct answer.

Step-by-step explanation:

In the given reaction,
`C_(2)H_(4)(g) + H_(2)(g) \rightarrow C_(2)H_(6)(g)` greatest increase in rate of reaction only occur when we increase the temperature and also increase the pressure.

This is because increase in pressure will bring the molecules closer to each other whereas increase in temperature will help in more number of collisions between reactant molecules.

Thus, this will lead to increase in formation of products. Hence, we can conclude that rate of reaction will increase with increase in temperature and increase in pressure.