The activity coefficient of thallium in amalgams at $293$ K are given below

x$200\mathrm{.}003260\mathrm{.}016750\mathrm{.}048560\mathrm{.}09860\mathrm{.}1680\mathrm{.}27010\mathrm{.}424$

$\backslash$gamma $21\mathrm{.}01\mathrm{.}0421\mathrm{.}2311\mathrm{.}7762\mathrm{.}8114\mathrm{.}3216\mathrm{.}1967\mathrm{.}707$

Determine the activity coefficient of mercury $($component$1)$ for the amalgam

at $10$ and $20$ percent thallium