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Gases Quiz 1

# Gases Quiz 1 - compressed air in a scuba tank at a pressure...

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CHEM 120 Chapter 6 Gases Practice Quiz 1 Name ________________________________ 2pts 1. What is pressure? Pressure if the Force exerted over an area. It can have units of torr, Atmospheres, psi, mm Hg, atm ( 1 atm = 760 mm Hg = 760 torr) 2pts 2. A sample of neon has a volume of 700 ml at a pressure of 1.20 atm and a temperature of 110 o C. What is the volume of the gas in milliliters when the pressure and temperature of the gas sample are change to 660 mm Hg and 10 o C? P 1 V 1 = P 2 V 2 T 1 T 2 Re-arrrange to solve for V 2 ( You can do this by leaving the left hand side as is and flip flopping the P 2 and T 2 over to the other side) P 1 V 1 x T 2 = V 2 T 1 P 2 ( 1.20 atm) (700 ml) x 283 K = V 2 = 715 ml = 700 ml 383 K 0.868 atm By plugging it in this way it will work because both the pressures now have the same units. I converted 660 mm Hg to atm by dividing it by 760 and the temperatures have been converted to Kelvin 2pts 3. 1.3 atm equals how many torr? X torr = 1.3 atm x 760 torr = 988 torr = 990 torr with sig figs 1 atm 2pts 4. A scuba diver 40 feet below the ocean surface inhales 50.0 ml of

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Unformatted text preview: compressed air in a scuba tank at a pressure of 3.00 atm and a temperature of 8 o C. What is the pressure of air in the lungs if the gas expands to 200.0 ml at a body temperature of 37 o C? P 1 = 3.00 atm P 2 = ? V1 = 50.0 ml V 2 = 200.0 ml T 1 = 8 C + 273 = 281 K T 2 = 37 C +273 =310 K P 1 V 1 = P 2 V 2 T 1 T 2 P 1 V 1 x T 2 = P 2 T 1 V 2 (3.00 atm x 50.0 ml) x 310 K = 0.827 atm 281 K 200.0 ml 2pts 5. A gas mixture containing oxygen, nitrogen and helium exerts a total pressure of 800 torr. If the partial pressure are oxygen 425 torr and helium 80 torr, what is the particle pressure (torr) of nitrogen in the mixture? P total = P O2 + P N2 + P He 800 torr = 425 torr + P N2 + 80 torr 800 – (425+80) = P N2 800 -505 = P N2 295 torr = P N2 (Note: In addition and subtraction look at number of places after decimal point to report final answer; Also, in this problem make sure all pressures are in the same units)...
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