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Ar(H)= 1
Ar(S)=32
Ar(O)=16
H=1*2= 2
S=12*1=12
O=16*4=64
Masa molecular:2+12+64=78 g/mol
NH₃
Ar(N)= 14
Ar(H)=1
N=14*1=14
H=1*3=3
Masa molecular:14+3= 17 g/mol
Fe₂O₃
Ar(Fe)= 56
Ar(O)=16
Fe=56*2=112
O=16*3=48
Masa molecular:112+48= 160 g/mol
Mg(OH)₂
Ar(Mg)=24
Ar(O)=16
Ar(H)= 1
Mg=24*1= 24
O=16*2=32
H=1*2=2
Masa molecular:24+32+2=58 g/mol
CaCO₃
Ar(Ca)=40
Ar(C)=12
Ar(O)= 16
Ca=2*1= 40
C=12*1=12
O=16*3=48
Masa molecular:40+12+48=100 g/mol
Na₂SO₄
Ar(Na)=23
Ar(S)=32
Ar(O)= 16
Na=23*2=46
S=32*1=32
O=16*4=64
Masa molecular:46+32+64=142 g/mol
CaSO₄ 2H ₂O
Ar(Ca)=40
Ar(S)=32
Ar(O)= 16
Ar(H)=1
Ca=40*1=40
S=32*1=32
O=16*4=64
H=1*4=4
O=16*2=32
Masa molecular:40+32+64+4+32=176 g/mol