41.  A gas mixture with 6% O₂ with pressure 1 atm at 27°C is entered a reactor with rate F, and another stream with pure O₂ with 2 atm pressure at 27°C entered the reactor with rate 1 liter/s, product has 10% O₂ with same conditions with rate P, what is the value of F? 
a.  575.5 liter/s 
b.  725 liter/s 
c.  895 liter/s 
d.  997.5 liter/s 
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Answer: (d).997.5 liter/s

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

43.  A gas mixture has 10% CH₄ with pressure 5 Pa at 27°C at the rate F, is passed through a reactor with another stream containing 60% CH₄ with pressure 5 Pa at 73°C at the rate 10 liter/s, if the percentage of CH₄ with pressure 5 Pa at 27°C in product is 80%, what is the value of F? 
a.  1 liter/s 
b.  1.4 liter/s 
c.  2 liter/s 
d.  2.6 liter/s 
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Answer: (b).1.4 liter/s

44.  A gas mixture with 50% H₂ at the rate F is passed through a reactor and it produced a gas mixture with 80% H₂ at the rate 15 liter/s, what is the value of F? 
a.  5 liter/s 
b.  8 liter/s 
c.  15 liter/s 
d.  24 liter/s 
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Answer: (d).24 liter/s

45.  A gas mixture with 20% O₂ with pressure 100 Pa at 27°C at the rate 50 liter/s is passed through a reactor and products a gas mixture with 40% O₂ with pressure 25 Pa at 27°C, what is the rate of product? 
a.  50 liter/s 
b.  100 liter/s 
c.  200 liter/s 
d.  400 liter/s 
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Answer: (b).100 liter/s
