chemical kinetics problem

The following data were obtained during the first order thermal Example 4.6 decomposition of N2O5 (g) at constant volume: 2N2O5(g)N2O4(g)+O2(g)S.No.1.2.Calculatetheconstant.Time/s0100TotalPressure/(atm)0.512 Let the pressure of N2O5(g) decrease by 2xaatm. As two moles of Solution N2O5 decompose to give two moles of N2Q4(g) and one mole of O2(g), the pressure of N2O4(g) increases by 2x atm and that of O2(g) increaces hy x atm