ICSE Class 10 Chemistry 2020 Solved Paper

Calculate the percentage of :
in sodium aluminium fluoride

[ {\Na}_3 {\AlF}_6]

, to the nearest whole number.
[Atomic Mass :

N a=23, A l=27, F=19

]

Question : 66 of 86

Marks: +1, -0

Fluorine

Solution:

Molecular Mass of

{\Na}_3 {\AlF}_6

=23 × 3+27+19 × 6=210

Percentage of fluorine

=\;{6 × 19}/{210} × 100=54.28 ≃ 54 \%

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