One compartment of an insulated rigid tank contains 2 kmol of CO2 at 20oC and 150 kPa

Question:

One compartment of an insulated rigid tank contains 2 kmol of CO2 at 20oC and 150 kPa while the other compartment contains 5 kmol of H2 gas at 35oC and 300 kPa.
Now the partition between the two gases is removed, and the two gases form a homogeneous ideal-gas mixture. The temperature of the mixture is
(a) 25oC
(b) 29oC
(c) 22oC
(d) 32oC
(e) 34oC