Question

less than 48 s, because there are fewer effective particle collisions per secondless than 48 s, because there are more effective particle collisions per secondmore than 48 s, because there are fewer effective particle collisions per secondmore than 48 s, because there are more effective particle collisions per second

Answer 1

According to the 2 trials, we observe that the concentration of HCl is higher in 2. We can assume that we have more particles in the solution so, we will have more collisions, and then the time will be lower.

Concentration HCl 1 < Concentration HCl 2

I think the answer is less than 48 seconds because there are more effective particle collisions per second.