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Solve[{n*nAr1 -
    nAr*(nAr + nFe + 2*n)*3.32*(10^-7)*(t^(5/2))*
     Exp[-18.27*(10^4)/t] == 0,
  n*nAr2 - nAr*(nAr + nFe + 2*n)*3.32*(10^-7)*(t^(5/2))*
     Exp[-32.035*(10^4)/t] == 0,
  n*nFe1 -
    nFe*(nAr + nFe + 2*n)*3.32*(10^-7)*(t^(5/2))*
     Exp[-9.16*(10^4)/t] == 0,
  n*nFe2 -
    nFe*(nAr + nFe + 2*n)*3.32*(10^-7)*(t^(5/2))*
     Exp[-18.77*(10^4)/t] == 0,
  n + nAr + nFe + nAr1 + nFe1 + nAr2 + nFe2 - 0.73*(10^28)/t == 0,
  n == nAr1 + nFe1 + 2*nAr2 + 2*nFe2,
  (nAr + nAr1 + nAr2)/(nFe + nFe1 + nFe2) == 0.9},
{n, nAr, nFe, nAr1, nFe1, nAr2, nFe2}]
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