7- In the first-order decomposition of dinitrogen pentoxide at 335 K, N,Os(g) → 2 NO:(g) + ½ O;(g) if we start with a 2.50-g sample of N2O5 at 335 K and have 1.50 g remaining after 109 s, (a) What is the value of the rate constant k? (b) What is the half-life of the reaction? (c) What mass of N2O5 will remain after 5.0 min?

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