How many moles of gas does it take to occupy 520 ml at a pressure of 400 torr and a temperature of 340 k
a.73.6 moles
b. 0.0098 moles
c.0.980 moles
d. 0.0735 moles

Which change will decrease the number of effective collisions during a chemical reaction? a. adding a catalyst b. increasing the surface area c. decreasing the temperature d. increasing the reactant concentrations e. increasing the volume of the reactants