A mixture with 60% O2 and 40% H2 with pressure 5 Pa at 27^oC at the rate 15 liter/s is passed through a reactor with another stream containing pure H2 with pressure 10 Pa at 27^oC at the rate 5 liter/s, what is the fraction of H2 with pressure 5 Pa at 27^oC in product?
(a) 0.2
(b) 0.4
(c) 0.6
(d) 0.8
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