1.

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, 0 = 16 u.

Answer»

Solution :The formula unit MASS of,
ZnO = 65 U+16 u = 81 u
`Na_(2)O = (2 xx 23 u) + 16 u = 46 u +16 u = 62 u`
`K_(2)CO_(3) = (2 xx 39 u) + 12 u + (3 xx 16 u) = 78 u +12 u +48 u = 138 u`


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