Factors Affecting the Value of Keq: Temperature Hof (in krmol) 26.48 -677.14 -69
ID: 1082861 • Letter: F
Question
Factors Affecting the Value of Keq: Temperature Hof (in krmol) 26.48 -677.14 -699.65 0.00 11.1 33.2 -1206.9 Compound Ca2+ (aq) CO2 (9) H20 (9) CO (9) So2 (9) SO3 (9) Hof (in kJ/mol) -542.83 -393.5 -241.8 -110.5 -296.8 -395.7 | Compound HI (9) cog2- (aq) H2CO3 (aq) H+ (aq) N204 (9) NO2 (9) CaCO3 (s) Which of the following equilibria will shift toward the products when heated? Check all that apply. H2(g) + CO2(g)-H2O(g) + CO(g) CaCO3(s)-Ca2+(aq) + CO32-(aq) 2 SO2(g) + O2(g) 2503(g) CO 2 H+(aq) + CO32-(aq) H2CO3(aq) 2HI(g)-12(s) + H2(g) N2O4(g) 2 NO2(g)Explanation / Answer
Given reactions,
H2(g) + CO2(g) <-----> H2O(g) + CO(g)
dH rxn = dH products - dH reactantans
dH rxn = (-241.8)+(-110.5) - ((0)+(-393.5))
dH rxn = 41.2 kJ/mol
CaCO3(s) <-----> Ca+2 (aq) + CO32-(aq)
dH rxn = dH products - dH reactantans
dH rxn = (-542.83)+(-677.14) - (-1206.9)
dH rxn = -13.07 kj/mol
2SO2(g) + O2(g) <------> 2SO3(g)
dH rxn = dH products - dH reactantans
dH rxn = (-395.7) - (-296.8)-(0)
dH rxn = -98.9 kj/mol
2 H+(aq) + CO3 2- (aq) <-----> H2CO3(aq)
dH rxn = dH products - dH reactantans
dH rxn = (-699.65) - (0)-(-677.14)
dH rxn = -22.51 kj/mol
2HI(g) <-----> H2(g) + I2(g)
dH rxn = dH products - dH reactantans
dH rxn = (0) + (0) - (26.48)
dH rxn = -26.48 kj/mol
N2O4(g) <-----> 2 NO2(g)
dH rxn = dH products - dH reactantans
dH rxn = (2*33.2) - (11.1)
dH rxn = 55.3 kj/mol
dH = -ve then the reactions are exothermic reactions if you increase the temperature (when heating) for these reactions then the equilibrium shifts to backward direction.
dH = +ve then the reactions are endothermic reactions if you increse the temperature for these reactions then the equilibrium shifts to forward direction.
hence the following reactions are shifted to product side when heated.
N2O4(g) <-----> 2 NO2(g)
H2(g) + CO2(g) <-----> H2O(g) + CO(g)
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