What fraction of the total pressure is exerted by oxygen, if equal weights of oxygen and methane are mixed in an empty vessel at 25°C ? August 30, 2021March 12, 2019 by admin What fraction of the total pressure is exerted by oxygen, if equal weights of oxygen and methane are mixed in an empty vessel at 25°C ? A. 2/3B. 1/3 C. 1/2 D. 1/3 × (298/273)