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mhoorfarTypewritten TextAssignment 4
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ENGR 375
Assignment 7
1. A constant-volume tank contains a mixture of 1 kmol of benzene ( 66HC ) gas and 30% excess
air at 25C and 1 atm. The contents of the tank are now ignited, and all the hydrogen in the
fuel burns to OH2 but only 92% of the carbon burns to 2CO , the remaining 8% forming CO
. Also, there will be extra 2O gas in the product. If the final temperature in the tank is 1000 K,
determine the heat transfer from the combustion chamber during the process. (Recall: for a
Closed Mass System (like the internal combustion engine) + [ +
( ) ] = [
+ ( ) ])
(Ans: 2200529 kJ/kmol fuel)
2. A constant-volume tank contains a mixture of 120 g of methane ( 4CH ) gas and 600 g of 2O at 25C and 200 kPa. The contents of the tank are now ignited, and the methane gas burns
completely (all the hydrogen and all carbon burns and produces OH2 and 2CO , respectively)
with excess 2O gas in the product. If the final temperature is 1200 K, determines (a) the final
pressure in the tank, and (b) the heat transfer during this process. (4=16 kg/kmol, 2=32 kg/kmol).
(Ans: (a) 805.4 kPa, (b) 5251.8 kJ)
In a combustion chamber, benzene gas ( 66HC )at 25C and 1 atm is burned with 95 percent
theoretical air (i.e., 5% insufficient air) at 25C and 1 atm. All the hydrogen in the fuel burns
to OH2 b, but certain percentage of the carbon burns to 2CO and the remaining forms CO .
If the final temperature in the tank is 1000 K find (a) the number of the mole fraction of CO
in the products, and (b) the heat transfer produced during combustion. (Recall: for a Control
Volume System (like the combustion chamber) + [ + (
)] =
[ + (
)])
(Ans: (a) 0.021, (b) 2,112,799.4 kJ/kmol fuel)
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Assignment 4-solutionAssignment 5-solutionAssignment 6-solutionAssignment 7-solution(1)
