For one mole of an ideal gas, which of these statements must be true ?
(a) U and H each depends only on temperature
(b) Compressibility factor z is not equal to 1
(c) CP,m – CV,m = R
(d) dU = CVdT for any process
(1) (a), (c) and (d)
(2) (b), (c) and (d)
(3) (c) and (d)
(4) (a) and (c)