What is the percent by mass of silicon in a sample of $S i O_{2}$ ?

21

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33

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47

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54

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78

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Solution

The correct option is C $47$ %
$M o l e c u l a r w e i g h t o f : S i = 28, O = 16 M o l e c u l a r w e i g h t o f c o m p o u n d = 28 + 2 * 16 = 60 P e r c e n t a g e o f S i = 28 / 60 = 47$

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