Two Moles of an Ideal Gas with a Volume of 4.00

Multiple Choice

Two moles of an ideal gas with a volume of 4.00 liters and a temperature of $0^{\circ} \mathrm{C}$ are mixed with one mole of an ideal gas with a volume of 3.00 liters and a temperature of $100^{\circ} \mathrm{C}$ . The volume of the mixture is 5.00 liters. What is the number density of the mixture?

A) $3.61 \times 10^{26} \mathrm{~m}^{-3}$
B) $1.98 \times 10^{26} \mathrm{~m}^{-3}$
C) $2.02 \times 10^{26} \mathrm{~m}^{-3}$
D) $4.00 \times 10^{26} \mathrm{~m}^{-3}$
E) $2.56 \times 10^{26} \mathrm{~m}^{-3}$