State whether each of the following statements is true or false: (a) ! iu ~ ! ih except for gases or highpressure processes. (b) in gas compression, a reversible process does maximum work. (c) ! iu is a state function. (d) ! iu = q + w for an open system. (e) cv is temperature independent for gases. (f) the internal energy of a real gas depends only on temperature.

Phosphoric acid is a triprotic acid ( =6.9×10−3 , =6.2×10−8 , and =4.8×10−13 ). to find the ph of a buffer composed of h2po−4(aq) and hpo2−4(aq) , which p value should be used in the henderson–hasselbalch equation? p k a1 = 2.16 p k a2 = 7.21 p k a3 = 12.32 calculate the ph of a buffer solution obtained by dissolving 18.0 18.0 g of kh2po4(s) kh 2 po 4 ( s ) and 33.0 33.0 g of na2hpo4(s) na 2 hpo 4 ( s ) in water and then diluting to 1.00 l.