Answer:
(i) 8 g
(ii) 160 g
Step-by-step explanation:
(i)
Convert the molecules into the number of moles.
3.011x10^23 / 6.022x10^23 = 0.5
There is 0.5 mol of oxygen.
Mass = mol x Mr
Mr of oxygen = 16
0.5 x 16 = 8
(ii)
Convert the amount of molecules into the number of moles.
6.022x10^24 / 6.022x10^23 = 10
There are 10 mols of oxygen
10 x 16 = 160