Rates of reaction

Practice Question Solving
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1

Hey guys, can anyone please explain why the answer is B? I thought it was A

To make sulfuric acid, the contact process is used. In one stage the following reaction takes place:
2SO2(g)+O2(g)⇌2SO3(g)
This is a highly exothermic reaction. What effect would an increase in temperature and increase in pressure have on the rate of this reaction?

A An increase in temperature would decrease the rate of reaction. An increase in pressure would increase the rate of reaction.
B An increase in temperature would increase the rate of reaction. An increase in pressure would increase the rate of reaction.
C An increase in temperature would decrease the rate of reaction. An increase in pressure would decrease the rate of reaction.
D An increase in temperature would increase the rate of reaction. An increase in pressure would decrease the rate of reaction.
E There would be no change in the rate of reaction by increasing temperature or pressure.

2

Rate of reaction does not depend on which direction the reaction is going to go.

the ror for this reaction would be -1/2 (dS02)/dt = -1 (dO2)/dt = +1/2(dSo3/dt)
so increasing temp we move the reaction backwards thus increasing the value of (dS02)/dt and (dO2)/dt thus increasing ror.

can apply the same logic to pressure increase.

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