Problem $1$: Let's assume that the Helium$-4$ gas is at $20\mathrm{.}0C,$ what should be the temperature of the Xenon$-132$ gas for them to have the same amount of internal energy $($assuming they have the same mass$).$

a$)8\mathrm{.}9$ K

b$)80$ K

c$)3\mathrm{.}5{10}^{2}K$

d$)9\mathrm{.}7{10}^{3}K$