①CCO 2 = c(N2)= p/(rt)= 100 kpa/(8.314 * 298)= 40.36 mol/m^3
②ρco2=mco2/v=44*40.36*10^(-3)=1.78kg/m^3
ρ(n2)=28*40.36*10^(-3)=1.13kg/m^3
③xco2=x(N2)=0.5
④ACO 2 = xco 2 * M CO2/(xco 2 * M CO2+x(N2)* M(N2))= 0.5 * 44/(0.5 * 44+0.5 * 28)= 0.61
a(N2)= x(N2)* M(N2)/(xco 2 * mco 2+x(N2)* M(N2))= 0.5 * 28/(0.5 * 44+0.5 * 28)= 0.39