Calculate the formula unit masses of ZnO, Na₂O, K₂C0_3, given atomic masses of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u, and O = 16 u.

Academic Chemistry NCERT Class 9

The formula unit mass of

(i) ZnO

= 65 u + 16 u

= 81 u

(ii) Na₂O

= (23 u x 2) + 16 u

= 46 u + 16 u

= 62 u

(iii) K₂C0₃

= (39 u x 2) + 12 u + 16 u x 3

= 78 u + 12 u + 48 u

= 138 u

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Updated on: 14-Mar-2023

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2. Calculate the formula unit masses of \( \mathrm{ZnO}, \mathrm{Na}_{2} \mathrm{O}, \mathrm{K}_{2} \mathrm{CO}_{x} \) given atomic masses of \( Z n=65 u \), \( N a=23 u, K=39 u, C=12 u . \) and \( O=16 u \).
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