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4-2 - Version 237 1 005 10.0 points For the reaction :31 i...

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Unformatted text preview: Version 237 1 005 10.0 points For the reaction », :31 i; ‘ 1. 2 C(s) + 2H2(g) w CQH4(9;) AH: : +523 k1 mol1 and as: = —53. 07 J K 11111015 at 293 K This reac— tion will be spontaneous at 1. no tei erature. {PM @. temperatures above 985 K ,. 3. temperatures below 985 K. 113.? 111311 4. all temperatures. 5. temperatures below 1015 K. 006 10.0 points 3.5 g of a hydrocarbon fuel is burned in a ves— sel that contains 250. grams of water initially at 25.00 C. After the combustion7 the temper— , ature of the water is 26.55 C. How much heat is evolved per gram of fuel burned? . *1 1" 4:63 J 3 1:1 {:3 /g Qt E? as; g J? 3111 Q? 2. 143 J/g “ 1._ 1 1 1‘: 3. 1105 J/g 81,11 ‘ fig e 4. 73. 1 1 5. 1263 J/g ‘3 1e ”7711 “7" 6. 511 J/g 11 l k 7. 26555 J/g s. 1754 J/g 007 10.0 points The internal energy of a substance can be brought to zero by cooling the substance all the way down to absolute zero ( T : 0 K). 1. False {E True Exam 4 1 McCord 1 (53740) 2 008 10.0 points Phosphine (the common name for PHB, a highly toxic gas used for 1fumigation) has 51 AH0 — 14.6kJ'mol_ and a 30 sap 1 map _ 78 83 J moi‘1 K_. What is the normal boiling point of phosphine expressed 1n centi— grade? 1 C _,.;:‘L_. 15251 '11 2 70.2 0C Memos 009 10.0 points Carbon monoxide reacts with oxygen to form carbon dioxide by the following reaction: 200(g) + 02(5) —> 2 002(5) AH for this reaction is —135.28 kcal. If 811.7 kcal is released, how many moles of CO must have reacted? 5. 40.5 mol 6. 270.5 mo] , RT 7. 135 mol 1‘1 010 10.0 points For the methanol combustion reaction 20113011“) ‘1' 302(g )“fi 2 002(9; )+ 4H20(g) estimate the amount of P AV work done and tell whether the work was done on or by the system. Assume a temperature of 27°C. 1. 7.5 kJ7 work done on the system ...
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