CHE 111 EXAM 5A NAME: NOVEMBER 28, 2017 Five points for each question Pv-nRT, R;

Question

CHE 111 EXAM 5A NAME: NOVEMBER 28, 2017 Five points for each question Pv-nRT, R; .08206 L-atmmol-K, R SID 8.314 JhmohK USEFUL Information: n 1. If the volume of a confined gas is doubled at constant temperature, what change is observed? a· The pressure of the gas is decreased to ¼ of its original value. b. The pressure of the gas is decreased to ¼ of its original value. c. The pressure of the gas is increased to twice its original value. d. The density of the gas is doubled e. The velocities of the molecules are doubled. 2. The lid is tightly sealed on an empty 2.0 L soda bottle at 27.0°C and 748 mm Hg. If the bottle is heated to 100.0°C, what is the pressure inside the bottle? a. 63 mm Hg b. 210 mm Hg c. 620 mm Hg d. 930 mm Hg e. 1300 mm Hg A 10.0 L flask contains 14.1 grams of an unknown gas. If the pressure in the flask is 2.3 atm at 65°C, which of the following is a possible identity of the gas? 3. NH3 co C. d. CO2 e. CS2 How many grams of 02 gas are there in a 5.00-L cylinder at 4.00 x 103 mm Hg and 23°C? A) 17.3g B) 34.7g C) 446 g D) 2.63 x 104 g 4. 5. Ifa gas effuses 1.73 times faster than Kr, what is its molar mass? a. 16.0 g/mol b. 28.0 g/mol d. 55.4 g/mol c. 36.6 g/mol e. 126.9 g/mol Equilibrium has been established between a liquid and its vapor when 6. there are equal quantities of liquid and vapor. all of the liquid has evaporated a. c. the liquid reaches its boiling point C. evaporation ceases and the concentrations of e. the rate of condensation equals the rate of evaporation

Explanation / Answer

1. Option (b) is correct

This is because, according to boyle's at constant temperature when the press of a gas is increased the volume decreases and vice versa, in other words... Pressure is inversely proportional to volume.

Hence if volume is doubled , the pressure will decrease to half.

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