In a 3L vessel, the following equilibrium partial pressures are measured; 

${\text{N}}_{\text{2}}\text{= 100\hspace{0.17em}\hspace{0.17em}mm\hspace{0.17em}\hspace{0.17em}of Hg,}$${\text{H}}_{\text{2}}\text{= 400\hspace{0.17em}\hspace{0.17em}mm\hspace{0.17em}\hspace{0.17em}of Hg}$ and ${\text{NH}}_{\text{3}}\text{= 1000\hspace{0.17em}\hspace{0.17em}mm\hspace{0.17em}of Hg}$.Nitrogen is removed from the vessel at constant temperature until the pressure of hydrogen at equilibrium is equal to $\text{700\hspace{0.17em}\hspace{0.17em}mm of Hg}$ . The new equilibrium partial pressure (in mm of Hg) of ${\text{N}}_{\text{2}}$ is