$\mathrm{N}{}_2\mathrm{O}{}_4(\mathrm{g})\rightleftharpoons 2\mathrm{NO}{}_2(\mathrm{g})$ is 20\% dissociated at $300\mathrm{K}$ and $1.0\mathrm{atm}$. On heating to $320\mathrm{K}$ at the same total pressure, $K_p$ doubles. The new degree of dissociation is

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