Question

1. What would be the AE (in kJ) for the following reaction if 6.300 moles of H,O were decomposed? 2 H2O → 2H, + 0, 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. CHAQ) + 3 C126) → CHC130 + 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/g°C 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/g°C) of an alloy that requires 59.3 kJ to raise the temperature of 125.0 g alloy from 298 K to 398 K.

Answer 1

AE 43 6 KJ P 2mst t AE 2 483.6k 2 Ane wer (2) C AE -336 kj AE-336 kJ he omtion u 3 Hel 12-0g 0- 36'S9/me mas malarma AE - -336 KJ o3S 3 AE 39-8 k^ (3) oo Cal 4.18 ঃ- 48 lat 418 7 Cal 41.8 Cee Q ms A AtE MS Q z 00J 200 A) At = 2D0 E At = SDAO.903 asxo 235 200 At 10.39 SORO. 38S 200 10.13 .Answer-D stnce ts 25x0. 19 At is 62.S 200 62.5 2S0.128

Given, Q 59.3 KJ 125 9 298 K z 398 K We knoo that QmSAt S१.३x।0 = 125 x S x (398-298) 9300 125 x100 x S SA 300 S