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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Solution

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

= 65 + 16

= 81 u

Formula unit mass of Na₂O = 2 × Atomic mass of Na + Atomic mass of O

= 2 × 23 + 16

= 62 u

Formula unit mass of K₂CO₃ = 2 × Atomic mass of K + Atomic mass of C + 3 × Atomic mass of O

= 2 × 39 + 12 + 3 × 16

= 138 u

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Z n O, N a_{2} O, K_{2} C O_{3}

Z n O, N a_{2} O and K_{2} C O_{3}

Z n = 65 u N a = 23 u K = 39 u C = 12 u O = 16 u

Z n O, N a_{2} O, K_{2} C O_{3}

Z n = 65 u, N a = 23 u, K = 39 u, C = 12 u

O = 16 u

{N a}_{2} O

A t o m i c m a s s o f N a = 23 u, O = 16 u

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