$$\begin{gathered} {\mathrm{N}}_2+3{\mathrm{H}}_2⟶2{\mathrm{NH}}_3 \\ 1\text{ mole }{\mathrm{N}}_2\text{ and }4\text{ moles }{\mathrm{H}}_2\text{ are taken } \end{gathered}$$

in 15 L flask at 27°C. After complete conversion of N₂ into NH₃, 5 L of H₂O is added. Pressure set up in the flask is

• A

  $\frac{3\times 0.0821\times 300}{15}\mathrm{atm}$

• B

  $\frac{2\times 0.0821\times 300}{10}\text{ atm }$

• C

  $\frac{1\times 0.0821\times 300}{15}\mathrm{atm}$

• D

  $\frac{1\times 0.0821\times 300}{10}\mathrm{atm}$