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Question

# Calculate the formula masses of the following compounds: (a) Sodium oxide, Na2O (b) Aluminium oxide, Al2O3 (Given: Atomic Masses: Na = 23 u; O = 16 u; Al = 27 u)

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Solution

## (a) The formula mass of sodium oxide, $\mathrm{Formula}\mathrm{mass}\mathrm{of}{\mathrm{Na}}_{2}\mathrm{O}=2×\mathrm{atomic}\mathrm{mass}\mathrm{of}\mathrm{Na}+\mathrm{atomic}\mathrm{mass}\mathrm{of}\mathrm{oxygen}\phantom{\rule{0ex}{0ex}}\mathrm{Formula}\mathrm{mass}\mathrm{of}{\mathrm{Na}}_{2}\mathrm{O}=2×23+16\phantom{\rule{0ex}{0ex}}\mathrm{Formula}\mathrm{mass}\mathrm{of}{\mathrm{Na}}_{2}\mathrm{O}=62\mathrm{u}$ (b) The formula mass of aluminum oxide, $\mathrm{Formula}\mathrm{mass}\mathrm{of}{\mathrm{Al}}_{2}{\mathrm{O}}_{3}=2×\mathrm{atomic}\mathrm{mass}\mathrm{of}\mathrm{Al}+3×\mathrm{atomic}\mathrm{mass}\mathrm{of}\mathrm{oxygen}\phantom{\rule{0ex}{0ex}}\mathrm{Formula}\mathrm{mass}\mathrm{of}{\mathrm{Al}}_{2}{\mathrm{O}}_{3}=2×27+3×16\phantom{\rule{0ex}{0ex}}\mathrm{Formula}\mathrm{mass}\mathrm{of}{\mathrm{Al}}_{2}{\mathrm{O}}_{3}=102\mathrm{u}$

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