2. Six grams of helium (molecular mass= 4.0 u) expands isothermally at 370 K and does 9600 J of work. Assuming that helium is an ideal gas, determine the ratio of the final volume of the gas to the initial volume.

3. A monatomic ideal gas (y=5/3) expands adiabatically, and the ratio of its initial to its final Kelvin temperature is Ti/Tt= 2.00. Find the ratio of its initial to its final pressure Pi/Pt.