One mole of argon gas is held in a rigid container whose volume is 22.41 L at 273.15 K. 3.000 kJ of heat is added. CV =12.47 J mol−1 K−1 a) What is the initial pressure of the gas? b) What is qsys? c) What is wsys? d) What is the final temperature of the gas? e) What is the final pressure of the gas? f) What is ∆E?

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.