Why do some substances diffuse more readily through a membrane than others

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.

What is dhmo? hint: you find it everywhere something is wet..