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quiz2A_solutions

quiz2A_solutions - YORK UNIVERSITY NAME £04914 ”9 FW...

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Unformatted text preview: YORK UNIVERSITY NAME: £04914 ”9) FW 2009 SC/CHEM 1000 3.0 Section A Student Number Quiz No. 2 October 29 2009 R = 8.314472 JK'lmol'l = 0.0820574 L atm K" mol'l k = 1.38066 x10‘23 J K'1 1 standard atmosphere = 1.013 x 105 Pa = 760 torr (mm Hg) Avogadro’s number NA = 6.02214199x1023 molecules mol'l 0°C = 273.15 K Atomic masses: carbon 12.011, oxygen 15.9994, hydrogen 1.0079, argon 39.948, nitrogen 14.0067. ALL FINAL ANSWERS MUST BE WRITTEN IN INK MARKS [4] l. A runner generates 250 k] of heat per km that they run. Assume this heat is lost by the evaporation of sweat (water). If the enthalpy of vaporization of water is 44.0 k] mol'l, how many liters of water must be lost in a 10.0 km race? (the density of water is 1.00 g mL'l). WW :— Zyaﬂx/Ohm : Zfoxlang—_ [Lm 7%,; WA bW7WML~75W Z: nélé; n c. ‘7, : XzS—x/03 M? 4w ,_ ‘5 AA : nf’l :fé’o’zy /8’~0/..> :vl-altpxlo <3 :. {6’51W_ 3 Villa, /~0‘7~§cxlo 44L 1 L07. L, 5—“ FW 09 SC/CHEM 1000 3.0 A Page2 Quiz No.2 [6] 2. Calculate q, w, and AU for the vaporization of 3.00 mol of ammonia (NH3) at its boiling point (—33.4°C) and under a constant pressure of 745 torr, given that the enthalpy of vaporization of ammonia is 23.3 kJ mol". iLAAH; = 3.233 = 69.9 N /_————. w = —— FAv W V/(I’iw 3:0 AV LVSaJZHW: 3~8'3“F“23?'7f F l’ w : — 3. Ewe-Z3775 =1 —— 5- 95’ fed" QM : 1+“! : £99 -—598 53 637/53— ‘75:" -1 3 V ,__ yrs-91¢x137'7r : 4.01on m 3"" 74f/7sa . purine! v ,1." W: - PAV=-Z&_5.xl-O(3zwrx \$0le0 5’578k-3 76 o [4] 3. Given CO<g> + Si02<s) a Si0<g) + C02(g) AH = + 520.9 k] ® 8C02(g) + Si3N4(s) —> 3Si02(s) + 2N20(g) + 8C0(g) AH = +461.05 k] (if Calculate AH for the reaction 5C02(g) + Si3N4(s) —> 3Si0(g) + 2N20(g) + 5C0(g) FW 09 SC/CHEM 1000 3.0 A Page 3 Quiz No. 2 [4] 4. Given the following standard enthalpies of formation: AHf°(C3H3(g)) = —103.85 kJ moi" AHf°(C02(g)) = -393.51 kJ moi" AHf°(H20(l)) = —285.83 kJ mol'1 AHf°(H20(g))= —241.82 kJ mol'1 Determine the enthalpy of combustion of propane (C3H3(g)) at 298K. Wm 63%(3) ”(S/01(3) a 3COLC<§)[email protected] 05% 2 EV? crow) -— Zvr OH?(rea/c/) _ 3 3 Atha?) k4<sl+o(#10) —[AHF[C;/48e3§ re 3 3(— 393’“) + 4513553) " (”103-617) [6] 5. Given the following bond dissociation energies BDE(O=O) = 497 kJ moi" BDE(C=O) = 743 kJ moi" BDE(C-C) = 348 kJ moi" BDE(C-H) = 412 kJ moi" BDE(O-H) = 463 kJ mo1" determine the enthalpy of the reaction ’f i r H-r-r-r-H H H H C3H3(g) + 502(g) —* 3C02(g) + 4H20(g) All 2 ZEDé/(W) -— EEOC—Jr) r 2 29LEVE[C-C)+ 8509(04) +5’60£(o-o) —— <4 doe/(ca) +83 506/0“) : 7.343%? +8. 4:11-5”. ¢?7—( 6-743 #8443) — 4477 mo? —— X-Iézxw3 g, —_—, —-/é€f k3“ W‘ [A FW 09 SC/CHEM 1000 3.0 A Page 4 Quiz No. 2 [6] 6. Use the definition of a state function to explain why the change in a state function for a process is independent of the path. Q M %«1//\x/72/\W 0mm flu/(O ¢iﬂ€§yf44~ When does U=3RT/2? In everyday words, what is the difference between heat and temperature? TM 436? W 72%.;Q475‘A.“ Aux/g QW gm Wm 7(ng W. THE END ...
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quiz2A_solutions - YORK UNIVERSITY NAME £04914 ”9 FW...

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