A vessel contains a mixture of nitrogen (m1=7.0 g)\left(m_{1}=7.0 \mathrm{~g}\right)(m1=7.0 g) and carbon dioxide (m2=11 g)\left(m_{2}=11 \mathrm{~g}\right)(m2=11 g) at a temperature T=290 KT=290 \mathrm{~K}T=290 K and pressure p0=1.0p_{0}=1.0p0=1.0 atm. Find the density of this mixture, assuming the gases to be ideal.