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ICSE Class 10 Chemistry 2020 Paper

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Calculate the percentage of :
in sodium aluminium fluoride [Na3AlF6][\mathrm{Na}_3\mathrm{AlF}_6], to the nearest whole number.
[Atomic Mass : Na=23, Al=27, F=19\mathrm{Na}=23,\ \mathrm{Al}=27,\ \mathrm{F}=19 ]
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Question : 67 of 86
Marks: +1, -0
Sodium
Solution:  
Percentage of sodium
=3×23210×100=32.85≃33%= \frac{3 \times 23}{210} \times 100 = 32.85 \simeq 33\%
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