To calculate universal gas constant $(R)$ experimentally, the thermal decomposition reaction of $KCl{O}_3$ is performed. The test tube containing $Mn{O}_2$ and $0\mathrm{.}8gKCl{O}_3$ is connected to a setup and the total amount of $KCl{O}_3$ undergoes thermal decomposition reaction. At $25C$ and under $758mmHg,$ the volume of produced $O_2(g)$ is $270mL.$ What is the experimental value of the universal gas constant? $($The vapor pressure of water at $25C$ is $23\mathrm{.}8mmHg)((($:$KCl{O}_3$:$122\mathrm{.}55\frac{g}{m}ol,O_2$:$32\frac{g}{m}ol$