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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.

### Q.:- 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.

*Answer:-*

Formula unit mass of ZnO = atomic mass of Zn + atomic mass of O

=(65 + 16)u = 81u

Formula unit mass of Na_{2}O = 2 X atomic mass of Na + atomic mass of O

=(2 X 23 +16)u = 62u

Formula unit mass of K_{2}CO_{3} = 2 X atomic mass of K + atomic mass of C + 3 X atomic mass of O

=(2 X 39 +12 + 3 X 6)u = (78 + 12 + 48)u = 138u

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