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Ethane is burnt with 20% excess O2 at 2 atm, conversion rate of ethane is 50%, what is the pressure at due point?

Ethane is burnt with 20% excess O2 at 2 atm, conversion rate of ethane is 50%, what is the pressure at due point? Correct Answer 0.9 atm

C2H6 + 3.5O2 -> 2CO2 + 3H2O, Basis: 100 moles of ethane => moles of O2 reacted = 175, => Product contains, moles of CO2 = 100, moles of C2H6 = 50, moles of O2 = 35, moles of H2O = 150, => fraction of H2O = 0.45, => Pressure at due point = 2*0.45 = 0.9 atm.

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