Practice Questions; Reaction Energy: 1) Determine the amount of energy released by the combustion of 550. g of ethane, C2H6. The water produced in the reaction will be gaseous. The amount of energy released is 26, 104.886... kJ ~ 26,100 kJ 2) Determine the amount of energy released/absorbed by the dissociation of 32 g of sodium bromide. Q = 0.0186... kJ ~ 0.019 kJ (this energy will be released) Standard Enthalpy of Formation for Various Compounds Compound AH'r (kJ/mol) Compound AH f (kJ/mol) Compound AH't (kJ/mol) Compound AH'r (kJ/mol) -315.4 AgzO(s) -30.6 C2HsOH(1) -277.6 HCI(g 92.3 NH4CI(s) Ag2S(s) -31.8 C2Ho(g) -84.7 HF(g) -268.6 NH4NO3(S) -365.1 -99.5 -90.7 NiO(s) -244.3 AgBr(s) C3Hs(g) -103.8 Hgo(s) AgCI(s) -127.0 n-C4H10(g) -124.7 HgS(s) -58.2 NO(g) +90.4 +33.9 AgI(s) -62.4 n-CsH12(1) -173.1 HI(g) +25.9 NO2(8) -734.7 Al203(S) -1669.8 co(g) -110.5 HNO3(1) -173.2 Pb304(s) BaCl2(s -860.1 CO2(g) -303 5 KBr(s) -392.2 PbBr2(s) -277.0 BaCO3(s) -1218.8 CoO(s -239.3 KCI(s) 435.9 PbCI2(s) -359.2 BaO(s -558.1 Cr203(s) -1128.4 KCIO3(S) -391.4 PbO(s) -217.9 BaSO4(S) -1465.2 CuzO(s) 166.7 KF(s) -562.6 PbO2(s) -276.6 Ca(OH)2(s) -986.6 CuO(s) 155.2 Mg(OH)2(s) 924.7 PCla(g) -306.4 CaCIz(s) -795.0 CuS(s) 48.5 MgCl2(s) -641.8 PCIs(g) -398.9 CaCO3(s) -1207.0 CuSO4(S) -769.9 MgCO3(s) -1113 SiO2(s -859.4 CaO(s) -635.5 Fe203(s) 822.2 MgO(s -601.8 SnCI2(s 349.8 CaSOA(S) -1432.7 Fe3 04(s) -1 120.9 MgSO4(s) -1278.2 SnCL() -545.2 CCL(1) -139.5 H2O(g) -241.8 MnO(s -384.9 Sno(s -286.2 CH3 OH(1) -238.6 H2O(1 285.8 MnO2(s) -519.7 Sno2(s) -580.7 CHA(g -74.8 H2O2(1) -187.6 NaCI(s) -411.0 SO2(g) 296.1 CHCI3(1) -131.8 H2S(g) -20.1 NaF(s 569.0 SO3(g) -395.2 C2 H2(8) -226. 2 SO4(1) -811.3 NaOH(s) -426.7 ZnO(s -348.0 C2 HA(g) +52.3 HBr(g) -36.2 NH3(g) -46.2 ZnS(s) -202.9 * All standard enthalpy values are at 25 C and 1 atmosphere of pressure