University:
Missouri State University
Course:
BIO 121 | General Biology I
Academic year:

2022
Views:

24

Pages:

1
Author:

granitt3c2r

Honors Chemistry Standard Heats of Formation Name: Heat of Formation Worksheet Use a standard enthalpies of formation table to determine the change in enthalpy for each of these reactions. a) NaOH(s) + HCl(g) ----> NaCl(s) + H2O(g) [(-411.0) + (-241.8)] – [(-426.7) + (-92.3)] = -133.8 kJ b) 2 CO(g) + O2(g) ---> 2 CO2(g) [2(-393.5)] – [2(-110.5)] = -566 kJ c) CH4(g) + 2 O2(g) ---> CO2(g) + 2 H2O(l) [(-393.5) + 2(-285.8)] – [(-74)] = -891.1 kJ d) 2 H2S(g) + 3 O2(g) ---> 2 H2O(l) + 2 SO2(g) [2(-285.8) + 2(-296.1)] – [2(-20.1)] = -1123.6 kJ e) 2 NO(g) + O2(g) ---> 2 NO2(g) [2(+33.9)] – [2(+90.4)] = -113 kJ Compound Hf (kJ/mol) Compound CH4(g) -74.8 HCl(g) -92.3 CO2(g) -393.5 H2O(g) -241.8 NaCl(s) -411.0 SO2(g) -296.1 H2O(l) -285.8 NH4Cl(s) -315.4 H2S(g) -20.1 NO(g) +90.4 H2SO4(l) -811.3 NO2(g) +33.9 MgSO4(s) -1278.2 SnCl4(l) -545.2 MnO(s) -384.9 SnO(s) -286.2 MnO2(s) -519.7 SnO2(s) -580.7 NaCl(s) -411.0 SO2(g) -296.1 NaF(s) -569.0 SO3(g) -395.2 NaOH(s) -426.7 ZnO(s) -348.0 NH3(g) -46.2 ZnS(s) -202.9 Hf (kJ/mol)