Chapter 6, Problem 6.10E

At $25.0°\text{C}$, helium molecules $\left(\text{He}\right)$ have an average velocity of $1.26\times {10}^5\text{cm}/\text{s}$, and methane molecules $\left({\text{CH}}_4\right)$ have an average velocity of $6.30\times {10}^4\text{cm}/\text{s}$. Calculate the kinetic energy of each type of molecule at $25.0°\text{C}$ and determine which is greater. Express molecular masses in $\text{u}$ for this calculation.