Question: 2Cr + 1.5 O2 = Cr2O3; DG = -1,110,100 + 247.3 T (joules) CO + 0.5 O2 = CO2; DG = -282,400 + 86.81 T

2Cr + 1.5 O2 = Cr2O3; DG = -1,110,100 + 247.3 T (joules) CO + 0.5 O2 = CO2; DG = -282,400 + 86.81 T (joules) H2 + 0.5 O2 = H2O; DG = -247,500 + 55.85 T (joules)

If the lowest partial pressure you can achieve in a vacuum furnace is 10^-7 atm, then by adding H2 gas, you could obtain a reducing condition for Cr2O3. What should the partial pressure of H2 be?

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