Question

1) How many molecules are there in 10 moles of O₂ (g)?

Answer 1

6.022e+24

Explanation: If you are trying to convert moles into molecules than you want to multiply the amount of moles (in this case 10) by Avogadro's number (6.022x10^23) and you get the number of particles/atoms/molecules. If you are trying to get the amount of moles from particles/atoms/molecules than you divide the number of molecules by Avogadro's number and get the amount of moles.

If you want to go from mass to mol

then divide by molar mass

If you want to go from mol to mass

then multiply by molar mass

Answer 2

Answer: There are 1.51×1023molecules O2 in 10.0 g O2 .