Question 5
Cases A and B of figure 17.1 hold the same mass of reactant. Why, then, is the rate of reaction greater in B?
The right answer is the one marked above.
Because the volume in B is smaller, so the pressure is greater and there are more collisions in unit time. Crowd the same eight particles into a smaller space and they are more likely to meet.
The mass, the temperature and the size of the particles are the same in both — the question says so. Volume is the only thing that differs.