A mixture is composed of the following number of moles of various species:
Species No. of moles
CO 0.095
CO2 6
H2O 7
N2 34
NO 0.005
A. Determine the mole fraction of nitric oxide (NO) in the mixture. Also, express your result as
mole percent, and as parts-per-million.
B. Determine the molecular weight of the mixture.
C. Determine the mass fraction of each constituent.
GIVEN: The following mixture:
Species # Moles i Yi MWi
CO 0.095 0.002 0.002 28.010
CO2 6 0.127 0.195 44.011
H2 O 7 0.149 0.094 18.016
N2 34 0.722 0.707 28.013
NO 0.005 106 10−6 111 10−6 30.006
TOTAL 47.1 1.0 1.0
FIND:
a) The mole fraction, mole %, and ppm of NO in the mixture
b) Determine the MW of the mixture
c) Determine the mass fraction of each constituent
Ni N NO 0.005
a) i
Ni N CO N CO2 N H2O N N2 N NO 0.095 6 7 34 0.005
NO 106 106 kmol/kmol-mix
MOLE % i 100 0.0106 %
N A
PPM
# NO
TOT #
1106 NO
Ni A
1106 NO 1106 106 ppm
where A ≡ Avogadro’s Number
b) MWmix i MWi CO MWCO CO2 MWCO2 H 2O MWH 2O N 2 MWN 2 NO MWNO
Consider a gaseous mixture consisting of 5 kmol of H2 and 3 kmol of O2. Determine the H2 and
O2 mole fractions, the molecular weight of the mixture, and the H2 and O2 mass fractions.
GIVEN: Mixture with 5 kmole H2 and 3 kmole O2
FIND: χ H2 , χ O2 , MWmix , YH2 , YO2
SOLUTION:
N 5
a) i i ; H2 0.625
N tot 53
O2 1 H2 1 0.625 0.375
b) MWmix i MWi H2 MWH2 O2 MWO2
0.625 2.016 .375 31.999
MWmix 13.260
MWi 2.016
c) Yi i ; YH2 0.625 0.095
MWmix 13.260
YO2 1 YH2 1 0.095 0.905
COMMENT: Even though the mole fraction of H2 is large, its low molecular weight results in its
having a small mass fraction.
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