A container of fixed volume contains \(8.72 \times 10^{23}\) helium atoms, each of mass \(6.646 \times 10^{-27} \mathrm{~kg}\). You put the container in a freezer and decrease its temperature from \(25.0{ }^{\circ} \mathrm{C}\) to \(-135{ }^{\circ} \mathrm{C}\). What are (a) the change in the thermal energy of the gas and \((b)\) the change in its entropy?