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The decomposition of N2O5(g) —> NO2(g) + NO3(g) proceeds as a first order reaction with a...

The decomposition of N2O5(g) —> NO2(g) + NO3(g) proceeds as a first order reaction with a half life 30.0s at a certain temperature.
If the initial concentration [N2O5]0 = 0.400 M, what is the concentration after 120 seconds?

A)0.050
B)0.200
C)0.025
D)0.100

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