200 Moles of an Ideal Gas with a Volume of 4.00

Multiple Choice

2.00 moles of an ideal gas with a volume of 4.00 liters and a temperature of 0 $^{\circ}$ C is mixed with 1.00 mole of an ideal gas with a volume of 3.00 liters and a temperature of 100 $^{\circ}$ C.The volume of the mixture is 5.00 liters.What is the N/V of the mixture?

A) 1.98 $\times$ 10²⁶ m^-3
B) 2.02 $\times$ 10²⁶ m^-3
C) 2.56 $\times$ 10²⁶ m^-3
D) 3.61 $\times$ 10²⁶ m^-3
E) 4.00 $\times$ 10²⁶ m^-3