(2) 2NO2 (g) O2 (g) 2 --→ + 1 N2O5 (g) ; t 1 ln = λ ⎛ │ ⎝ ⎞ │ ⎠ 0.15 0.05 ; nPb = no. of mole of Pb206 -102.6 ∆fH° = = -51.3 .
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