A piston compresses the air in the cylinder by doing 67.0 J of work on the air. As a result, the air gives off 149.0 J of heat to the surroundings. If the system is the air in the cylinder, what is the change in its internal energy?

Quiz1. which physical state of nitrogen has the highest entropy? a solid© b gasoc liquid

Which are forms of frozen water? check all that apply. dew frost hail rain sleet

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.