2. (old exam problem) When a vapor deviates slightly from ideal gas behavior, you would expect the Z (compressibility factor) value to be closest to which selection? Circle your selection and explain. i. Z=0.95 ii. Z=1.04 iii. Z=0.35 3. (old exam problem) Consider U as a function of T and P. In other words, U=U(T,P). Write the differential for U (which is dU ) in terms of T and P