Question

1. What would be the AE (in kJ) for the following reaction if 6.300 moles of H20 were decomposed? 2 H2O + 2H2 + O AE = 483.6 kJ (for reaction as written) 2. The value of AE for the reaction below is -336 kJ. Determine the amount of heat (in kJ) evolved when 13.0 g of HCl is formed. CH4(9) + 3 Cl2(g) - CHCI) + 3HCIO) 3. If 1.00 cal = 4.18 J, what does 41.8 cal equal in J? 4. Which of the following (with specific heat capacity provided) would show the largest temperature change upon gaining 200.0 J of heat? A) 50.0 g AI, CAI = 0.903 J/gºC B) 50.0 g Cu, CCu = 0.385 J/g°C C) 25.0 g granite, Cgranite - 0.79 J/g°C D) 25.0 g Au, CAU = 0.128 J/g°C E) 25.0 g Ag, CAg = 0.235 J/gºC 5. Determine the specific heat capacity (in J/gºC) of an alloy that requires 59.3 kJ to raise the temperature of 125.0 g alloy from 298 K to 398 K. 6. A 12.8 g sample of ethanol (CaH5OH) is burned in a calorimeter with a heat capacity of 5.65 kJ/°C. Assume the heat from the sample is negligible compared to the calorimeter. Determine the initial temperature of the calorimeter if the final temperature is 85.7°C. The molar mass of ethanol is 46.07 g/mol. CH,OH + 3 O2(g) + 2 CO2(g) + 3 H2O) qrxn = -1235 kJ
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Answer 1

AE = 483.6 KJ js 2th0 2t2 +02 Whan 2 md H,0deiompoar 483.6 KJ AE Rer 63 mol KJ 936x6-2ph) 2mp )/ 11 Be 1523.3 KT fi 6.3mol ef wats decompoalusn CHy + 305 CHC3 3HC AE AE--336 KT Molaor 16ghol55 & Imon mas' 109:5 9 (3x365 Stoichion 169 retay l06.59 (1xl6) (3x.35.5)

toten, loa.5 c anad RCI fosmad DE is -336KJ 120 -336 KJX13 /1 109.59 739.8901 KT AE=-39.990y KJ okan HCt is emed M 1 Cal 4.18 J 41.8Cal 41TX48 Ca cal St 174.724 J The much Joule is there