use standard enthalpies of format to calculate Hrxn for each reaction.
1:2H2S (g) +3O2 (g) 2H2O (l) 2SO2 (g)
2: 3NO2 (g)+H2O (l) 2HNO3 (aq) +NO (g)
3: N2O4 (g) + 4H2 (g) N2 (g) +4H2O (g)
4: CR2O3 (S) +3CO (g) 2CR
(S)+3CO2 (g)
Calculate Kc for each reaction and predict whether reactant and product s will be favor at equilibrium
1: CH3OH(g) CO (g) + 2H2 (g)
2: 2CO2 (g)+2CF2 (g) 4COF2 (g)
3: 6COF2 (g) 3CO2(g)+3CF2 (g)
4: 2CH3OH (g) 2CO (g) +4H2 (g)
Q1.
HRxn = Hproducts - Hreactants =
1:2H2S (g) +3O2 (g) --> 2H2O (l) + 2SO2 (g)
HRxn = Hproducts - Hreactants
HRxn = 2*H2O + 2*SO2 - (2H2S + 3O2)
HRxn = 2*−285.830 + 2*−296.81 - (2*−20.6 + 3*0)
HRxn = -1124.08 kJ/rxn
2: 3NO2 (g)+H2O (l) --> 2HNO3 (aq) +NO (g)
HRxn = Hproducts - Hreactants
HRxn = 2*HNO3 + 2*NO - (3NO2 + H2O)
HRxn =2*−174.1 + 2*+90.2 - (3*33.2 + −285.830)
HRxn = 18.43 kJ/rxn
3: N2O4 (g) + 4H2 (g) --> N2 (g) +4H2O (g)
HRxn = N2 + 4*H2O - (N2O4 + 4*H2)
elemental N2 = H2 = 0
HRxn = 4*H2O - (N2O4)
HRxn = 4*−241.826 - 9.2
HRxn = -976.504 kJ/rxn
4: Cr2O3 (S) +3CO (g) --> 2Cr (S)+3CO2 (g)
HRxn = 2*0 + 3*−393.51 -(−1139.7 + 3*−110.53)
HRxn = 290.76 kJ/mol
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