`50 mL` of dry ammonial gas was sparked for a long time in an eudiometer tube mercury. After sparking, the volume becomes `97 mL`. After washing the gas with water and drying, the volume becomes `94 mL`. This was mixed with `60.5 mL` of oxygen and the mixture was burnt. After the completion of the combustion of `H_(2)`, the volume of the residual gas was `48.75mL`. Derive molecular formula of ammonia.

Answer

`NH_(3)`;