# Worksheet: Internal energy of Monatomic and Polyatomic Gasses

In this worksheet, we will practice calculating the division of a gas’s internal energy between translational, rotational, and vibrational energies according to its particles' degrees of freedom.

**Q2: **

Two monatomic ideal gases A and B are at the same temperature. 1.0 g of gas A has the same internal energy as 0.10 g of gas B.

What is the ratio of the number of moles in gas A to the number of moles in gas B?

- A
- B
- C
- D
- E

What is the ratio of the atomic mass of gas A to the atomic mass of gas B?

- A
- B
- C
- D
- E

**Q3: **

To give a helium atom nonzero angular momentum requires 21.2 eV of energy, meaning that 21.2 eV is the difference between the energies of helium’s ground state and of the lowest-energy state in which a helium atom has nonzero angular momentum. Find the lowest temperature at which helium atoms possess angular momentum if the energy required to give a helium atom nonzero momentum equals Boltzmann’s constant multiplied by .

- A K
- B K
- C K
- D K
- E K