How many moles are there in 1 mole of argon?

the atomic mass of argon is 39.948. That means that one mole of argon weighs 39.948 grams (39.948 g/mol).

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.