I found another question like this. Someone answered "The best answer to this question is adding a catalyst.
Adding a catalyst will cause the greatest increase in the rate of reaction for this chemical reaction , 8Zn(s) + S8(s) 8ZnS(s). ---> adding a catalyst always affects the rate of a reaction."
Catalyst is the substance which is used to increase the rate of reaction. Thus adding the catalyst will give the greatest increase the rate of reaction by following the path which would have less activation energy.
Increasing the temperature will do increase the rate of reaction as kinetic energy of the reactants increasing thereby increasing the number of collisions.
Increasing the surface area and increasing the concentration will also increase the rate of reaction but the greatest increase will be shown by the addition of the catalyst.
As pressure decreases, the volume of a gas increases at a given temperature., so since the balloon got bigger, the new pressure must be less than 103kPa
Assuming the temperature does not change, use Boyles Law
