What effect will the number of particles and temperature have on the rate of diffusion of gas molecules? a. the rate of diffusion decreases with the increase in number of particles and temperature. b. the rate of diffusion increases with the increase in number of particles and temperature. c. the rate of diffusion increases with the increase in number of particles and decrease in temperature. d. the rate of diffusion decreases if the number of particles and temperature are kept constant. e. the rate of diffusion increases if the number of particles and temperature are kept constant.