Which layer of the atmosphere is chemically stratified, with the lightest molecules riding above heavier molecules?

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

Can someone me with 6 to 10 plz this is for masteries test.

40dm3 of gas at 760 torr are heated from 5°c to 50°c what is the new volume