Determine the percentage composition of each of the compounds below?

[Eleese]

1) KMnO4
K=
Mn=
O=
2)HCl
H=
Cl=
3)Mg(NO3)2
Mg=
N=
O=
4)(NH4)3PO4
N=
H=
P=
O=
5)Al2(SO4)3
Al=
S=
O=