One compartment of an insulated rigid tank contains 2 kmol of CO₂ at 20°C and 150 kPa while the other compartment contains 5 kmol of H₂ gas at 35°C 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) 25°C

(b) 30°C

(c) 22°C

(d) 32°C

(e) 34°C