What mass of nitrogen are there in a $50.0$ g sample of sodium nitrate ( $N a {N O}_{2}$ )?

20.2

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16.4

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10.1

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8.23

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23.4

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Solution

The correct option is A $10.1$ g
The atomic masses of $N a$ , $N$ and $O$ are $23$ g/mol, $14$ g/mol and $16$ g/mol respectively.
The molecular weight of $N a N O_{2}$ is $23 + 14 + 2 (16) = 69$ g/mol respectively.
Thus, $69$ g of $N a N O_{2}$ contains $14$ g of nitrogen.
The mass of nitrogen in a $50.0$ g sample of sodium nitrate is $50.0 \times \frac{14}{69} = 10.1$ g.

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