Find the percentage of nitrogen in ammonia.

Explanation

Number of moles`=("Mass of the element")/("Atomic mass of the element")`
`(27)/(27)`[Atomic mass Al=27] (ii)Moler mass of `NH_3=1xx` atomic mass of nitrogen +`3xx` atomic mass of hydrogen
`=(1xx14)+(3xx1)` Percentage of N in`NH_3=("mass of nitrogen")/("molar mass of" NH_3)xx100`
`=(14)/(17)xx100`
`=0.8235xx100`
The percentage of nitrogen in ammonia=82.35%
(iii) Molecular of `C_2H_6=(2xx"atomic mass of C")+(6+"atomic mass of H")`
`=(2xx12)+(6xx1)`
24+6=30g