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Chapter 15, Problem 27.
A certain natural gas has the following volumetric analysis: 65 percent CH
4
, 8 percent H
2
,
18 percent N
2
, 3 percent O
2
, and 6 percent CO
2
. This gas is now burned completely with
the stoichiometric amount of dry air. What is the air–fuel ratio for this combustion
process?
Chapter 15, Problem 32.
Octane (C
8
H
18
) is burned with dry air. The volumetric analysis of the products on a dry
basis is 9.21 percent CO
2
, 0.61 percent CO, 7.06 percent O
2
, and 83.12 percent N
2
.
Determine (
a
) the air–fuel ratio and (
b
) the percentage of theoretical air used.
Chapter 15, Problem 34.
Methane (CH
4
) is burned with dry air. The volumetric analysis of the products on a dry
basis is 5.20 percent CO
2
, 0.33 percent CO, 11.24 percent O
2
, and 83.23 percent N
2
.
Determine (
a
) the air–fuel ratio and (
b
) the percentage of theoretical air used.
Chapter 15, Problem 40C.
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 Summer '08
 Husanu

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