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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 : 68 of 86
Marks: +1, -0
Aluminum
Solution:  
Percentage of Aluminium
  27210×100=12.85≃13%\; \frac{27}{210} \times 100 = 12.85 \simeq 13 \%
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