quiz1A_solutions

quiz1A_solutions - YORK UNIVERSITY NAMEM FW 2009 SC/CHEM...

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Unformatted text preview: YORK UNIVERSITY NAMEM FW 2009 SC/CHEM 1000 3.0 Section A Quiz No. 1 October 8 2009 50 Minutes 30 Marks NOTE: ALL FINAL ANSWERS MUST BE WRITTEN IN INK R = 8.314472 JK'lmol‘] = 0.08205 L atm K" mol" 0°C = 273.15 K k = 1.38066 x 10'23 J K'1 Avogadro’s number NA = 6.022x1023 molecules mol'1 1 standard atmosphere = 1.013 x 105 Pa = 760 torr (mm Hg) Atomic masses: Lithium 6.941,carbon 12.01 1, oxygen 15.999, hydrogen 1.008, argon 39.948, nitrogen 14.007. MARKS [3] 1. A gas thermometer can be used to determine temperature by measuring the pressure of a known amount of gas held in a bulb. A 6.00 L gas bulb contains 6.40 g of oxygen (02) at 23.6°C. What is the pressure exerted by this gas? I p V=ARI P. 600 = égocvaxoa 276-2 31-00 [9: 0'811 aim (of? é/7v‘2vr) 8-22 x/o4Pq) The bulb is put in an oven and the gas pressure increases by 12%, what is the temperature in the oven? Vd’Aw—C W T1 '71:; F7. ;fi 777 '1”. ML: jj; ’1’: 332'4—K 176'8' 0K §?_30C FW 09 SC/CHEM 1000 3.0 Page 2 Quiz No. 1 [4] 2. The planet Venus has an atmosphere that can be considered as made up only of carbon dioxide (C02). Assume that the C02 is an ideal gas, calculate the density of the atmosphere, in g/L, at the surface where the pressure is 9.3 MPa and the temperature is 460°C? 4 . 0:211 :Ji’l , 93x") _ l/ KT a /~0!’5xmr x a/ 008,105“. 733-2 = M” / [5] 3. Lithium metal (Li(s)) reacts with nitrogen (N2(g))to produce lithium nitride (Li3N(s)). A small piece of lithium was placed in a 1.6L container of pure nitrogen at a pressure of 1150torr and 250°C. After all the lithium had reacted the pressure in the container was reduced to 956 torr. What mass of lithium nitride had been produced? 64%;) + “3(7) ‘5 2453MB) 43Vzus’o—‘7s’é = ’94 W' r1r7= 3(é-?q,l>+l<y009- AL V 3 C. ~ .,. ~ IV 1 ,C (L N.— L¢Mr0= ’2 3 : Zzl'éé9kl01fl/W’CL 4mm Ltd/V: 1KK'66?L/0’I\<3{V'83 :_ 1.13 (2530’ > FWV09 SC/CHEM 1000 3.0 Page 3 ' QuiZNof l [5] 4. p ' At what temperature is the average speed of a nitrogen molecule (N2) twice that of an Argon ' atom (Ar) at 300K? ' H' "8.5121. ’ u- , Ar — 7/" 77'7faf0’3 pm fiflfif... :1 393.7 m," 77"?“ W WV, = ZKUAr = 77‘7'Fms'l a : (It, a ¢,3‘3"+- Tun. "1 1117*“ 7r. 2mm, 7?.7- I: P. J 77" za-ow L-fléoxmri’ 8’. 3mm 77/1, 77" Lana“, 7;,” r. Pvt/c [7] 5. A flask contains twice as many molecules of Argon (Ar) as Xylene (CgHm). Gas is allowed to escape through a small orifice in the flask. After 100 5, 0.010 mole of argon has escaped. How long will it take for 0.015 mole of xylene to escape? 0 Ola/M79 Z. wéz /5_o _: ’C FW 09 SC/CHEM 1000 3.0 Quiz No. l [6] 6. Page 4 For each of the following questions give a clear concise answer. Answers of more than 20 words will not be marked. Under what conditions can we NOT assume a gas is ideal? Why does hydrogen gas (H2) never show a compressibility factor (Z) less than 1, while carbon dioxide (C02) showsvalues greater and less than 1? Are 457/1. , “Wu (Arte-V‘s <é ova/(H WWW/MW W WMw/V-élf THE END ...
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quiz1A_solutions - YORK UNIVERSITY NAMEM FW 2009 SC/CHEM...

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