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PMT1 C122 W11

PMT1 C122 W11 - Helpful Information is found at the end of...

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Helpful Information is found at the end of the exam 1. (5 pts) The atmospheric pressure is 760 mm Hg. What is the pressure (atm) of the enclosed gas when h = 14.5 cm? a) 0.945 atm b) 0.985 atm c) 1 atm d) 1.07 atm e) 1.19 atm 2. (6 pts) At 25.6 0 C and 753 mm Hg, a sample of gas has a volume of 125 mL. What would be the temperature of the gas ( 0 C) if the pressure was increased to 1.75 atm and the volume was reduced to 31.3 mL? 3. (7 pts) Calcium hydride reacts with water to form hydrogen gas. How many grams of CaH 2 (g) are needed to generate 25.0 L of H 2 gas at a pressure of 755 torr at 18.0 0 C? P(H 2 O) at 18.0 0 C = 15.48 torr (MW: CaH 2 = 42.1, H 2 = 2.016, Ca(OH) 2 = 74.10) 3 CaH 2 (s) + H 2 O(l) → 2 Ca(OH) 2 (g) + 2 H 2 (g) a) 1.06 g b) 18.5 g c) 49.1 g d) 64.3 g e) 96.6 g 1

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4. (6 pts) The density of a gas at 75 0 C and 573 torr is 1.48 g/L. What is the molecular mass of this material? 5. (5 pts) Consider a mixture of two gases, A and B, confined in a closed vessel. A quantity of a third gas, C, is added to the same vessel at the same temperature. What is the effect on each of the following Partial pressure of B Total pressure Mole fraction of A 6. (5 pts) Which statement is false? a) The average kinetic energies of molecules from samples of different "ideal" gases is the same at the same temperature. b) The molecules of an ideal gas are relatively far apart. c) All molecules of an ideal gas have the same kinetic energy at constant temperature. d) Molecules of a gas undergo many collisions with each other and the container walls. e) Molecules of greater mass have a lower average speed than those of less mass at the same temperature. 7. (6 pts) A compound effuses through a porous membrane 2.65 times slower than helium. Identify this compound. a) H 2 b) Ar c) Xe d) H 2 O e) N 2 2

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