Which of the below has second highest percentage by mass of nitrogen?

$N a N O_{3}$

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$C O (N H_{2})_{2}$

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$C a (N O_{3})_{2}$

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$N H_{4} N O_{3}$

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Solution

The correct option is D
$N H_{4} N O_{3}$

By calculation you will find,

Molecular mass of $N a N O_{3}$ =85, $C O (N H_{2})_{2}$ =60, $C a (N O_{3})_{2}$ =164 and $N H_{4} N O_{3}$ =80.

We also know the mass of nitrogen is 28g/mol.

Therefore Percentage of nitrogen will be calculated using,

$P e r c e n t a g e o f N i t r o g e n = \frac{(M a s s o f n i t r o g e n) \times (100)}{M a s s o f g i v e n m o l e c u l e s}$

The only thing you have to do here is change the molecular mass of molecules for the given options.

After doing some math the percentage of nitrogen for respective options is as below,

a)16.4%, b)46.67%, c)17.07%, d)35%

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