Calculate the total $\mathrm{K}.\mathrm{E}.$ of the molecules in $16 g$ of $O_2$ gas at $27°\mathrm{C}$. $R=8.31$ joule ${{}^{\circ }C}^{-1}{ \mathrm{mole}}^{-1}$.

Estimate the average thermal energy of helium atom at room temperature $27°\mathrm{C}$

Estimate the average thermal energy of helium atom at

the temperature on the surface of the sun $\left(6000\mathrm{k}\right)$,

Estimate the average thermal energy of helium atom at the temperature of the ${10}^7$ Kelvin (the typical core temperature in the case of a star). Given $k=1.38\times {10}^{-23}{\mathrm{JK}}^{-1}$.