Question

Write the percentage composition of the given elements $Ag,N$, and $H$ in $Ag{\left(N{H}_3\right)}_2^{+}$.

• A. $76.1$%, $19.7$%, $4.2$%
• B. $66.1$%, $29.7$%, $3.2$%
• C. $56.1$%, $19.7$%, $7.9$%
• D. None of the above
  

Answer 1

The correct option is A $76.1$%, $19.7$%, $4.2$%

The molar masses of Ag , N, H are 08 g/mol, 14 g/mol and 1 g/mol respectively.
1 mole of $Ag(N{H}_3{)}_2^{+}$ will contain 1 mole of Ag, 2 mole of N and 6 moles of H respectively.
1 mole of $Ag(N{H}_3{)}_2^{+}$ will contain 108 g Ag, 28 g N and 6 g H.
Hence , total mass of 1 mole of $Ag(N{H}_3{)}_2^{+}=108+28+6=142$ g.
The percentage of Ag $=100\times \frac{108}{142}=76.1$ %
The percentage of N $=\frac{100\times 28}{142}=19.7$ %
The percentage of $H=\frac{100\times 6}{142}=4.2$%