University:
Mississippi College
Course:
CHE 141 | General Chemistry I
Academic year:

2022
Views:

50

Pages:

2
Author:

Abby D.

Abby DaiteyAdvanced Hess's Law Practice Problems1. Given the following equations and AH values, determine the heat ofreaction (kJ) at 298 K for the reaction:B2H6(g) + 6 Cl2(g) -22 BCl((g) + 6 HCI(g)Goalx2 BC13(g) + 3 H2O(1) H3BO3(g) + 3 HC1 (g) AHo/kJ = -112.5rev DH= 225KJno () + H2O(1) 2 H3BO3 (s) + 6 H2 (g) AH%/KJ = -493.4nux B2H6(g)+6+120(1) 2H3.BO3(s)+GH1(g) DH=-493,4KJx12 1/2 H2 (g) + 1/2 C12 (g)HC1(g)AHo/kJ - -92.36th(g)+6c12(g) 12HC1(g)AH= -1107.6KJB2HG(g)+6C12(9) 2BC13(g)+6HC1C9) AH= -1376KJ2. Given the following equations and AH values, determine the heat ofreaction (kJ) at 298 K for the reaction:2 OF2(g)+2S(s)->SO2(g)+SF4(g)Goalsnorev2 OF2(g) + H2O(1) O2(g) + 2 HF(g)AHo/kJ = -276.620F2(g)+2H20(e) - 202(g)+4HF(g)AH= -SS3.2KJnev SF4(g) + 2 H2O(1) 4 HF(g) + so(g)AHo/kJ = -827.54HFCg)+502(9) SF4(g)+2H2O(e)AH= 827.5KJX2 S(s) + 02 (g)SO2(g)AH°/kJ = -296.925(5)+202(g) 2502AH 593.8KJ20F2(g)+25cs)SO2(g)+SFy(g) AH=-319.5KJ 3. Determine AH%k for the following reaction using the listed enthalpiesof reaction:N2H4(I) +2 H2O2(g)->N2(g)+4H2O(1)norevnotN2H4(1)O2(g)N2(g) + 2 H2O(1)AHo/kJ = -622.3 KJN2(g)+2+20(e)AH==622.3KJnare H2(g)/+ 1/2 0,(g)H2O(1)AHo/kJ = -285.8 KJ+x2 342(g) Ozig) 2H20(e)DH°=-571,6KJrev H2 (g) O2(g) H2O2(1)AH°/KJ = -187.8 KJx2AH 375.6KJ- 818.3KJ4. Calculate the value of AH%k for the following reaction using the listedthermochemical equations:CbPO(g)nere1/4 P.(s) + 3/2 C12(g)PC13(g)AHo/kJ - -306.4P4(5) +AH = - 1225.6KJruv P.(s) 5 02 (g) P.O2c(g)AHo/kJ = -2967.3noxAH==1296731rev PC13(g) + C12(g)PC1s(g)AH%/kJ = -84.246AH=50S.2KJnorev.PC13(g) +1/2O2 (g)C1,PO(g)AHO/kJ = -285.7x10 AH'= 2857KJP4010(g)+6PC15(g)10C13P0(g) AH'= - 610.1KJ