ch1020_2008b_exam1

ch1020_2008b_exam1 - MacDonald CHM1020 Exam 1 Name You must...

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MacDonald, CHM1020, 11/11/2008, Exam 1 1 Name: ___________________________________________ Score: ________/75 You must show your work in order to receive partial credit on problems. Potentially useful information R = 0.08206 L•atm/mol•K STP = 0 °C and 1.00 atm 0 °C = 273 K 1 atm = 760 torr = 760 mm Hg 1 mol of gas at STP occupies 22.4 L __________________________________________________________________________________________________ x. If you place 12.5 g of liquid nitrogen (N 2 ) into an empty balloon and seal it, what will be the final volume of the balloon at STP (standard temperature and pressure) after all the liquid nitrogen converts to N 2 gas? [x pts] x. Backpacking stoves commonly use canisters of fuel that contain mixtures of compressed propane (C 3 H 8 ) gas and butane (C 4 H 10 ) gas. When a stove is turned on, the mixture of gases is released from a pinhole and then ignited. a. Calculate the relative rate at which propane effuses compared to butane. b. Does propane diffuse faster, slower, or at the same rate as butane? Circle your answer. [x pts] faster slower at the same rate x. Carbon dioxide gas (CO 2 ) commonly is used in fire extinguishers because it is heavier than air and retards combustion by displacing oxygen. Calculate the density (d) of CO 2 in g/L at 22.0 °C at 755 torr. [x pts]

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MacDonald, CHM1020, 11/11/2008, Exam 1 2 x. Acetylene gas (C
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ch1020_2008b_exam1 - MacDonald CHM1020 Exam 1 Name You must...

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