Find the percentage by mass of silicon in a sample of silicon dioxide?

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%
The atomic masses of Si and O are 28.1 g/mol and 16 g/mol respectively.
The molar mass of silicon dioxide $S i O_{2} = 28.1 + 2 (16) = 60.1 g / m o l$ .
The percentage by mass of silicon in a sample of silicon dioxide $= \frac{28.1 \times 100}{60.1} = 47$ %.

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Find the percentage by mass of silicon in a sample of silicon dioxide?

The correct option is C 47%The atomic masses of Si and O are 28.1 g/mol and 16 g/mol respectively.The molar mass of silicon dioxide SiO2=28.1+2(16)=60.1 g/mol. The percentage by mass of silicon in a sample of silicon dioxide =28.1×10060.1=47 %.

The correct option is C 47%
The atomic masses of Si and O are 28.1 g/mol and 16 g/mol respectively.
The molar mass of silicon dioxide $S i O_{2} = 28.1 + 2 (16) = 60.1 g / m o l$ .
The percentage by mass of silicon in a sample of silicon dioxide $= \frac{28.1 \times 100}{60.1} = 47$ %.