chemistry

0.1 mole of aluminium oxide contains
1)0.2 mole of cations
2)0.3 mole of cations
3)0.2 mole of anions
4)0.5 mole of particles
A)1,3
B)1,4
C)2,4
D)1,2,4


One mole of oxygen contains y atoms,how many atoms are there in one mole of water?
A)y/2
B)2y/3
C)3y/2
D)2y

answers with explanation