\(x \propto \,\,\frac{1}{{\sqrt P }}\,\,\,\,\,\,\,\,\,\,\,\,x\,\, \propto \,\,\sqrt V \)
\(\frac{{{x_2}}}{{{x_1}}} = \frac{{\sqrt {16V} }}{{\sqrt V }}\,\,\,\,\,\,\,\frac{{{x_2}}}{{{x_1}}} = \frac{{4\sqrt V }}{{\sqrt V }} \Rightarrow \,{x_2} = 4{x_1}\)
${I_2}(g)$ $\rightleftharpoons$ $2I(g),\;\Delta H_r^o(298\,K) = + 150\;kJ$
${I_2}(g)$ $\rightleftharpoons$ $2I(g),\;\Delta H_r^o(298\,K) = + 150\;kJ$