(a) Will a gas mixture containing 97% H2O and 3% H2 oxidize
nickel at 1000 K?

(b) An alloy...

Question

(a) Will a gas mixture containing 97% H2O and 3% H2 oxidize
nickel at 1000 K? 

(b) An alloy containing 10 at % Ni and 90 at % Au is a solid
solution to 1000 K. It is found that this solution reacts with water vapor to
form NiO. Assume that approximate measurements indicate that the reaction
reaches equilibrium when the water vapor–hydrogen mixture contains 0.35%
hydrogen by volume. Find the corresponding value of the activity coefficient
γ of Ni in the alloy.

Dr Shweta · Accepted Answer

Solution
Answer 1.  
For a gaseous mixture that contains 97% H2O and 3% H2, the involved chemical reactions for oxidation of nickel at 1000K are as follows:
Ni + 1/2O2                                      NiO [ δG0 = -35000Cal] ----[1]
H20                                      H2 + + 1/2O2   [ δG0 = +45600Cal] ----[2]     
On adding equation 1 and 2 we get,
  Ni + H20                                     NiO + H2 ---------[3]
 For equation 3,

(a) Will a gas mixture containing 97% H2O and 3% H2 oxidize nickel at 1000 K? (b) An alloy containing 10 at % Ni and 90 at % Au is a solid solution to 1000 K. It is found that this solution reacts...

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