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One mole of pure N2O5(g) is placed in a vessel kept at 75° C. The decomposition...

One mole of pure N2O5(g) is placed in a vessel kept at 75° C. The decomposition of N2O5 is first order and occurs according to the overall equation N2O5(g) → 2NO2(g) + 1/2 O2(g) with k = 4.30 x 10-3 s-1 at 75° c. What is the mole fraction of N2O5 in the gas mixture after 100 seconds ?

A. 0.65

B. 0.18

C. 0.14

D. 0.21

E. 0.43

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