Need help with problems #1-14.

Pressure units PROBLEMS Gases 1. Comver esch pressure to an equivalent pressure in reandard atenorpheres a) 748mmHgg b) 63.1cmHg c) 1044 torr d) 52 psi Ans: a) 0.984 b) 0.830 c) 1374 d) 3.5atin 2. Calculate the beight of a mercury column required to produce a pressure of: a) 1.38atm b) 934 tom o) equal to that of a colarnn of waser 126ft bigh Ans: a) 1050mm b) 934mm c) 2.82m General Gas Laws 3. A gas occupying 2.30L at 100C is allowed to warm up 10.25C. What will be the new gas volume if pressuro is conctant? Aas: 3.96L 4. A gas at 1621kPa occupies 11.0L at 36C. What will be its ncw volume if the temperature was changed to 16C and the prespure to 3647kPa ? Ans: 4.57 L 5. A gas at 0C bas a volume of 22,414L. What is its volume at 25C ? Ans, 24.47 L 6. The volume of a large, iregularly shaped, closed tank is detemined as follows: The tank is first evacuated and is thes connected to a 50L cylinder of compressed altrogen gas. The gas pressure in the cylinder, originally at 21.5 atm, falls to 1.55 atm after is is connected to the evacuated tank. What is the volume of the aak? Ans: 644L(6941) ? 7. A bubble of radias 1.5cm forms 10m below the surface of a poid. If the temperature of the bobble remains conarata, what is its volume when it reaches the top of the pond where the pressure is 1.0atm ? The total pressure at a depth of 10 m is about 2.1atm Ans: 29.69cm3 8. A quantity of aydrogea gas is confined in a chamber of constant volume. When the chamber is inmersed in an ice-water bath the absolute pressure of the gas is 1000mmHg. a) What is the Celsius temperature wben the pressure is 100mm Hig? b) What pressure will bo indicated when the temperature is tronght to 100Cl Ans: a) 246C b) 1366mm 9. A motoris checked his tires at the start of a rip and the tire gange read 25 pi, The temperature wai 21C. Afer driving for several bours the motorist checked his tires again. The gauge fressure was 31 psi. To what temperature had the air in the tires been heated? Assame the volume was constant. Ans: 654C Ideal Gas Law Tues febly Contcat PV aRl 10. If 2.0 moles of O2(1) accupy 200L at 0C, determine the pretrue (in kPa af the gas. Ans: 22.7kPa 11. Flow many moles of N2(e2 can be contained in a 3.50L cylinder at 35C and 202.6kPa ? Ans: 0.277mol 12. If 200mL of a gas has a mass of 0.268g at STP, what is its molar masn? Ans: 30.0gmol 13. A sample of a gas at 7C and 304kPa pressure contains 1.3E22 molecules. What is the volume of the gas? Ans: 0.165L 14. A glass bulb with a volume of 2.75L contains 0.220g of He in) at a presiure of 20.3kPa. What was the temperatare of the bullo? Aas: 122K