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5 The Ideal Gas Law and The Molecular Weight of Gases

5 The Ideal Gas Law and The Molecular Weight of Gases - tr...

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Unformatted text preview: tr 1'4 /(g, 5 f— 20 A Name MW flo\\0fi‘\c_l Section 00V EXPERIMENT 5 : THE IDEAL GAS LAW AND THE MOLECULAR WEIGHT OF GASES k7 PRE-LABORATORY QUESTIONS CU E The following preparatory questions should be answered before coming to lab. They 2 E are intended to introduce you to several ideas that are important to aspects of the E : experiment. You must turn in your work to your instructor before you will be : 2 allowed to begin the experiment. 1 1. State the ideal gas law in equation form. What does each symbol in the equation stand for and what is its proper unit? PV : n ET 'A‘ P : We assure (Mimi; V : Volume (1:3 to: number 05?— “0de (mot) R 3 I‘m (”‘3 ““5th News mE 33$? y T: Temperohxe QKBWIHB /2./’H0w can one determine the molecular weight of a gas from the ideal gas law? W ' ' n lo \ RT i‘l‘hfih dmole y the / ““53 OFV l mole 0'? the (30%. Solve for Y): 3. ) Define Avogadro’slaw. Chem14 14-Academic Year 2010/201 l 5*“1 . 4 % - _, “xx Two given mnaples 0% an idem qua, on- we aame mef pressure and volume, Cm‘tnlm hoe eame number 09 mm: :6; A b) In equation form, Avogadro’s law is .___.—_ -: K Y) 4. Y.H. Al-Mamary determines the mass of an unknown gas to be 5.07 grams at 23 °C and 710 mm Hg in a 3.0 L container. What is the molecular mass of the unknown gas? (show work) Y1“ PV T: 230 C : 2010 K V 2 3.0 L. R T R 2 0108206 P: 710mm+b3x 1m : 0330?”?! 1&0mmfi :3 A n : (mam ) (33.01:) . , : O .l\ mo! (0. 02209) (2mm) 5ng 2: 4 O-Hmm (0% The “unknown” gas among the following) is most probably: a) methane, CH4, b) propane, C3Hg, c) butane, C4H10 d) pentane, C5H12? A Chem1414—Academic Year 2010/2011 5_2 Name Madam chatrd Section Col RESULTS Table of Densities of Dry Air (in grams/liter) Pressure, P in millimeters of mercur (mm. H 760 770 _{ Temperature of the room 245 °C 26% K Barometric pressure j3$,3 mm Hg Ofl “5 atm 1738.3 x loflrm 7QOMM Densityair (from table above) \1 \56 g/L H5 Massair ( from Eqn. 3) 0.051 8 g DWR'W ‘8 \iommc \ ASSQ I ‘50 m L \ L. g 74 if... ' '- \OOOmL Show your calculation here: Mass of air-filled s rin 6 Mass of gas-filled syringe I Carbon dioxide 6‘5 . 33’? Nitrogen 85 . 3&1 ‘? ’5 5 _ 306 ' I Unknown 333-36“! 3 3, me SIGN-OUT: gment is put away, and the .1 ench is clean and dry. Date ’3, i TA Cheml414—Academic Year 2010/2011 5_5 % Carbon dioxide gas Massgas (from Eqn. 2) Q ,(54353 g Show your calculation here: Mozsgqa :2 0505 4—week- m‘rwfimé Jr one-sag? _-_ 35.33143 — 35.30%?— 0.057393, Molecular weight of gas (from Eqn. 1) 43, Z g/mol Show your calculation here: ~ MN : me? _ CLQSSgg (G.0820Q>) 7mm , W ‘ Zommwiaxmq - Nitrogen gas Massgas (from Eqn. 2) Q ,EEEAE g Show your calculation here: mfl‘éfiggg = 35.30% .. 35.36% + (3‘ Q§1%§ 43.15163 Molecular weight of gas (from Eqn. 1) Tl \ C0 g/rnol Show your calculation here: NM : (oxosas 5333 $32545}:an ' 6. Cl't\‘\a+4m Q0571; " Unknown gas Massgas (from Eqn. 2) 0 Ski-ES g Show your calculation here: W35£é~é¢5~ seawar- 0.0"5'l§g '= 0.0(46 Molecular weight of gas (from Eqn. 1) 1s 43* g/mol Show your calculation here: m: 2 {meme (omega X’wfi‘: WWW , ‘ : ’l.‘\‘a\4<a Gfiififigfim £05 1...) . Cheml4l4-Academic Year 2010/2011 5 6 Name Mfiif‘filw) $$X®§fii Section (3m POST LABORATORY QUESTIONS 1. Using atomic weights from the periodic table, calculate the molecular weights of carbon dioxide and nitrogen. Compare your experimental values with the calculated values, i.e. calculate the percentage error for each gas as followsi exp erzmental value - accepted value x 1 00 % relative error — accepted value Give a plausible reason why the experimental value might differ from the calculated value. ,, I ‘1Q‘imfi M AAfiM C5,)! m» M “mm .1; . 2% m... a N1: l$01°§flpfioi AAFG‘ ,‘sMQ , flea/mo: - 23.02 35:22:31, , {a ‘ ZSAzfiwa MW \. got) .14 \ o/Q Thea could digger mafia 0;. WW?) ’\ m meme 6 re méxfifrfig , 2. Based upon the following choices and your results, what is the most likely identity of the unknown gas? g3; _MW 9“ 4.0026 V - ' 20.179 (3sz 26.02 NO 30.01 Ar . 39.948 N02 46.01 802 64.07 Cheml4l4—Academic Year 2010/2011 5—7 33% 2% Chem 1414 student named A.D. Zeckser isolated an “unknown” gas in a glass bulb with a volume of 2.50 L at a temperature of 22 °C and pressure of 110 mm Hg. The gas A weighed 505 mg. What is the molar mass of the gas? 231%: :2: FEE; / NE W“ ’33 13’3”” :Gfiésfim 7&05‘WEEE Sssn’g'fik his www.mm ‘31.; 0‘503‘5‘ lemme; ‘1 {5‘qu {2‘36} 3:} H: W - p a 0.5655 (O‘EWGQXZQE‘DVQ L l “ gimme": T“ 3‘04 almél Out of the following gases, which one closely matches the “unknown”? a) C2H2 b) C02 C) H28 (1) CO e) CH4 4. Compute the approximate density of argon, Ar at 22.0 °C and 710 mm Hg. 22°c=2<lsx mowmf‘ x l ‘ l v * WE , MM 2: mm W '3'? -— EM MW _ P d maawfiéqé RT ' k A 5E” 7’ ’=— L5 $23.. Chem14l4—Academic Year 2010/201 l 5_8 ...
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