GATE MT 2011 Q36. For the following reactions, the standard free energy change us given by at 1773 K as follows: If chromium oxide powder reduces by hydrogen in a fluidized bed, the minimum pH2 / pH2O ratio that has to be maintained at the exit of the reactor:
GATE MT 2011 Q36. For the following reactions, the standard free energy change us given by at 1773 K as follows: If chromium oxide powder reduces by hydrogen in a fluidized bed, the minimum pH2 / pH2O ratio that has to be maintained at the exit of the reactor:
Share
Correct answer is option D. Equation 1: 2/3 Cr2O3 = 4/3 Cr + O2 ΔG01 Equation 2: 2H2 + O2 = 2H2O ΔG0 2 Equation 1 + Equation 2= 2/3 Cr2O3 + H2 = 4/3 Cr + 2H2O ΔG0 3 ΔG0 3 = 150800 = -RT ln(pH2O/ pH2) (pH2/pH2O) = 166.5
Correct answer is option D.
Equation 1: 2/3 Cr2O3 = 4/3 Cr + O2 ΔG01
Equation 2: 2H2 + O2 = 2H2O ΔG0 2
Equation 1 + Equation 2= 2/3 Cr2O3 + H2 = 4/3 Cr + 2H2O ΔG0 3
ΔG0 3 = 150800 = -RT ln(pH2O/ pH2)
(pH2/pH2O) = 166.5
See lessFirst try to find a balanced equation where Cr2O3 will be reduced by hydrogen. To do this add the two reactions. Then add the free energies if the reactions in similar manner. You will get the free energy of the reaction.
First try to find a balanced equation where Cr2O3 will be reduced by hydrogen. To do this add the two reactions. Then add the free energies if the reactions in similar manner. You will get the free energy of the reaction.
See less