CH4 is burnt with 100% excess O2 at atmospheric pressure, if CH4 conversion is 100%, what is the pressure at dew point?(a) 0.2 atm(b) 0.4 atm(c) 0.6 atm(d) 0.8 atmI got this question in unit test.My doubt stems from Saturation in division Real Gases: Equations of State, Single Component Two Phase Systems, Saturation & Condensation of Basic Chemical Engineering

CH4 is burnt with 100% excess O2 at atmospheric pressure, if CH4 conve

1.	CH4 is burnt with 100% excess O2 at atmospheric pressure, if CH4 conversion is 100%, what is the pressure at dew point?(a) 0.2 atm(b) 0.4 atm(c) 0.6 atm(d) 0.8 atmI got this question in unit test.My doubt stems from Saturation in division Real Gases: Equations of State, Single Component Two Phase Systems, Saturation & Condensation of Basic Chemical Engineering
Answer» Correct CHOICE is (b) 0.4 atm The best I can explain: CH4 + 2O2 -> CO2 + 2H2O, Basis: 100 moles of CH4, => moles of O2 reacted = 200, => Product contains, moles of CO2 = 100, moles of H2O = 200, moles of O2 = 200. => FRACTION of H2O = 0.4, => Pressure at due point = 1*0.4 = 0.4 atm.

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