Calculate the formulae unit mass of zno , na2o, k2co3
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Zn = 65.3 Oxygen = 16
Zn + O = 81.3
Na x 2 = 23 x 2 → 46
Na2O → 62
K x 2 → 62
C → 12
O x 3 → 48
K2CO3→122
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