Calculate the formula masses of the following compounds (i) Sodium oxide, Na2O
(ii) Aluminium oxide, Al2O3
(Given Atomic masses Na = 23 u ; O = 16 u ; Al = 27 u)
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a. Na2o
Na=23 u
O=16 u
23×2+16= 62 u
b. Al2O3
Al=27 u
O=16 u
27×2+16×3=102 u
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