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Calculate the formula unit masses of ZnO...

Calculate the formula unit masses of `ZnO , Na_(2) O , K_(2) CO_(3)` , given atomic masses of Zn = 65 u , Na = 23 u , K = 39 u , C = 12 u , and O = 16 u

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Formula unit mass of ZnO = 65 + 16 = 81u
Formula unit mass of `Na_(2)O=2xx32+16`
= 46 + 16 = 62u
Formula unit mass of `K_(2)CO_(3)=2xx39+12+3xx16`
= 78 + 12 + 48
= 138u
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