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28/12/2020 11:32 am
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Calculate the formula unit masses of ZnO, Na2O, K2CO3. Given atomic masses of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u and, O = 16 u.
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28/12/2020 11:46 am
Formula unit mass of ZnO = atomic mass of Zn + atomic mass of O
= (65 + 16)u = 81 u
Formula unit mass of Na2O = 2 x atomic mass of Na + atomic mass of O
= (2 x 23 + 16)u = 62 u
Formula unit mass of K2CO3 = 2 x atomic mass of K + atomic mass of C + 3 x atomic mass of O
= (2 x 39 + 12 + 3 x 16)u = (78 + 12 + 48) u
= 138u