Tentukan Mr dari molekul molekul Na2S, (NH4)2SO4​

• Ar H = 1 ; N = 14 ; O = 16 ; Na = 23 ; S = 32

• Mr Na2S
= 2.23 + 32
= 46 + 32
= 78

• Mr (NH4)2 SO4
= 2(14 + 4.1) + 32 + 4.16
= 2(14 + 4) + 32 + 64
= 2(18) + 96
= 36 + 96
= 132

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