A rigid vessel of volume 0.50 m3 containing H2 at 20.5oC and a pressure of 611 x 103 Pa is connected to a second rigid vessel of volume 0.75 m3 containing Ar at 31.2oC at a pressure of 433 x103 Pa. A valve separating the two vessels is opened and both are cooled to a temperature of 14.5oC. What is the fina1 pressure in the vessels?