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CHEM1050_Midterm - Page l I point each 28 points in total...

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Page l. I point each. 28 points in total for Multiple Choice. For each question enter the one correct answer on the TEST SCORING SI{EET in pencil. The TEST SCORING SI{EET will be considered final no matter what you marked on the examination paper. 1. Given 2 CzHa(S) - 2Czfu(S) + 2Hz(il aH : -64.2W /)'i,' eS; :-'? aH for the reaction of6,000 g of C2H6 k) to give C2FIa(S) and Hz(S) is: r t,! : !.t . *b. Ilr'' {*\', A) 6.41 W {U - 6.41kJ C) - 64.2 kI D) -12.8 kJ E) - 2s.6W 2. Which of the following statements is tue for the combustion of propane, C:Hs(g), to produce carbon dioxide and water vapor in a bomb calorimeter ? ,D) q=o E) aH: aU 3. A calorimeter containing 200 mL of water was calibrated by carrying out a reaction which absorbed 15.6 kJ of heat. r ; = - i ,- ,!, ,t'' The temperature of the calorimeter and contents fell 3.25 'C. 5 t'i s;::1 : . The heat capacrty of this calorimeter and contenJs was: l,= coj!- | :, :;'i:". A -4.80 kJ/"C B) 4.80 kJmL/"C C) 15.6 kJ/"C D) 9.60kJl"C ,,py 4.80 kJ /"c .I t-. ,1 I 4. The standard enthalpy of subiimation of bromine is 40.1 kJ'moil and the standard enthalpy of fusioir of bromine is 10.6 kJ'mol-l. The enthalpy of vaportz?nonof liquid bromine is: A) - 50.7 kJ'mol-l B) +50.7kJ'mol-l,,g*' *29.5kJ'mol-l D) -zg.skJ'mol-l E) - 10.6 kJ'mol-r ;;,0t *''-t,tj tr' 5. Given that the standard molar enthalpy of formation of ozone, 03 , is'+ 142.7 kJ/mol and , i--^ Oz (g) - 2 O(g) aHo : * 498.4 kJ t.4 '/ i--2 * , NO(g)+Or(g)rNOzG) +Oz(g) aHo: -200kJ :5'i'l:- \ - -'''''', Calculate the reaction enthalpy for $ -'" i;i-* /.:f Noz (d No (e) + o (g) N aU:O @ q:au 9l w :.aIJ A) +ss2 kJ B) + ts2k| "6 .307 kJ D) +.555 kJ E) + 355 kJ 'e/
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Page2. The standard enthalpy of forrration of KCI($ is -437kJ-mol-1. In aBorn-Haber cycle for KCI(s) which changes are exotherrnic? the lattice enthalpy and the electron affinity of the chloriae atom the electron affinity of the chlorine atom and the reverse of the lattice enthalpy of KCI(s) the formation of Cl(g) from Cl2(g) the sum of the sublimation enthalpy of K(s) and the first ionization energy of K(g) the lattice enthalpy of KCI(s) 7, Which of the following substances has the largest standard molar entropy at29gK and I ah ? A) Ae B) Au tibiiine \"r'9 D) Pb E) Fe A) ffi c) D) E) Estimate the standard molar enthalpy of forrnation of gaseous carbon monoxide, from the following data:@E : bond energy) n\ : Aooa , ,:: , '\ .
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