1. What is the internal energy of 1 mol of a monatomic ideal gas at 400K? Answer in units of Joules.

2. Helium gas is held at a temperature of 300K. If a single particle of helium has a mass of 6.65x10^-27kg, what will be its speed at this temperature? Answer in units of m/s.

3. 1 mol of a diatomic ideal gas expands adiabatically, doing 10J of work. What is the change in temperature of the gas? Answer in Kelvins. (Hint, adiabatic means that heat is neither added nor removed from the gas.)