Determine the value of the rate constant k, Chemistry

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Determine the value of the rate constant k

At the 335 K in the first-order decomposition of dinitrogen pent oxide, assume we start with a 2.50 g sample of N2O5 at 335 K and which is having the 1.50 g remaining after 109 s.
N2O5(g) 2 NO2 + 1/2 O2
1. Determine the value of the rate constant k?
2. Discuss the mass of N2O5 will remain after the 5.1 min?

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Chemistry: Determine the value of the rate constant k

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