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In a closed rigid vessel, the following equilibrium partial pressures are measured, where \( \mathrm{N}_{2}=100 \) \( \mathrm{mm}, \mathrm{H}_{2}=400 \mathrm{~mm} \) and \( \mathrm{NH}_{3}=1000 \mathrm{~mm} \). Now, nitrogen is removed from the vessel until the pressure of hydrogen at equilibrium is equal to \( 700 \mathrm{~mm} \). The new equilibrium partial pressure of \( \mathrm{N}_{2} \) is
(a) \( 11.94 \mathrm{~mm} \)
(b) \( 200 \mathrm{~mm} \)
(c) \( 18.66 \mathrm{~mm} \)
(d) \( 43.78 \mathrm{~mm} \)
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