Question

What is the percentage composition of the elements in ammonia($N{H}_3$)?

• A. 75.6%, 82.35%
• B. 56.7%, 65.40%
• C. 64.3%, 34.60%
• D. 82.35%, 17.65%

Answer 1

Answer: (D)

82.35%, 17.65%

In $N{H}_3$ there are 3 H-atoms and 1 N-atom
Molecular weight of $N{H}_3=17g$
%age composition of N in $N{H}_3$ $=\frac{molecularweightofN}{molarmassofN{H}_3}\times 100=\frac{14}{17}\times 100=82.35$%
%age composition of H in $N{H}_3$ $=\frac{molecularweightofH}{molarmassofN{H}_3}\times 100=\frac{3}{17}\times 100=17.65$%