Use scientific notation with 2 significant digits, in the format of x.xEx. For example, v = 2.5E-4.

Nitrogen pentoxide gas decomposes according to the reaction: 2N2O5 = 4NO2 + O2

At 328 K, the rate of reaction v under certain conditions is 2.2 x 10-4 mol L-1s-1. Assuming that none of the intermediates have appreciable concentrations,

1- d[N2O5]/dt = ??? mol L-1s-1

2- d[NO2]/dt = ??? mol L-1s-1

3- d[O2]/dt = ??? mol L-1s-1

4- Assuming the reaction is first order, the concentration of N2O5 is 0.2 mol L-1, the half time of N2O5 is ????? s