The first-order rate constant for the decomposition of N₂O₅, given below, at 70C is 6.82 10^-3 s^-1. Suppose we start with 0.0400 mol of N₂O₅(g) in a volume of 4.0 L.

2 N₂O₅(g) 4 NO₂(g) + O₂(g)

(a) How many moles of N₂O₅ will remain after 2.5 min? mol (b) How many minutes will it take for the quantity of N₂O₅ to drop to 0.005 mol? min (c) What is the half-life of N₂O₅ at 70C? min