Solution.
"n_{H_2}=0.500mol;"
"n_{O_2}=0.300mol;"
"n_{CO_2}=1.200mol;"
"T=25^oC=298K;"
"P_{total}=2 atm;"
"P_{total}V=n_{total}RT;"
"V=\\dfrac{n_{total}RT}{P_{total}};"
"n_{total}=n_{H_2}+n_{O_2}+n_{CO_2};"
"V=\\dfrac{(0.500+0.300+1.200)mol\\sdot0.082L \\sdot atm \\sdot mol^{-1}K^{-1}\\sdot298K}{2atm}=24.44L;"
"P_{O_2}=n_{O_2}\\dfrac{RT}{V};"
"P_{O_2}=0.300mol \\dfrac{0.082L\\sdot atm\\sdot mol^{-1}\\sdot K^{-1}\\sdot298K}{24.44L}=0.3atm;"
Answer: "V=24.44L;"
"P_{O_2}=0.3atm;"
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