The volume of nitrogen evolved on complete reaction of $$9\ \mathrm g$$ of ethylamine with a mixture of $$\mathrm{NaNO_2}$$ and $$\mathrm{HCl}$$ at $$273^\circ\mathrm C$$ and $$1\ \mathrm{atm}$$ pressure is

A

$$11.2\ \mathrm{dm^3}$$

B

$$5.6\ \mathrm{dm^3}$$

C

$$4.48\ \mathrm{dm^3}$$

D

$$22.4\ \mathrm{dm^3}$$