A gas-phase decomposition of 2N2O(g)4NO2(g)+O2(g) takes places in a constant volume container of 10.0dm3 at a constant temperature of 67C. When a certain amount of N2O5(g) is added into the container at the beginning, the initial pressure reading is 27.9atm. After 1 minute, the pressure in the container has risen to 40.2atm. a) What is the molar concentration of N2O5(g) at the beginning? b) What is the mole fraction of reacted N2O5(g),, after 1min ? c) What is the molar concentration of N2O5(g) after 1min