Reference no: EM131260597
Problem -
Benzene (C6H6) as a gas burns in air at 200% theoretical air. In answering the following parts, you may assume the products of combustion are CO2, H2O, O2, and N2. You may also assume the following:
![1989_Figure.png](https://secure.expertsmind.com/CMSImages/1989_Figure.png)
Table 2.2 Heat of formation Δh-of in kJ/mole (at 25°C and 1 atm)a (abstracted from Reference [2])
Substance
|
Formula
|
State
|
Δh-of(kJ/mole)
|
Oxygen
|
O2
|
g
|
0
|
Nitrogen
|
N2
|
g
|
0
|
Graphite
|
C
|
s
|
0
|
Diamond
|
C
|
s
|
1.88
|
Carbon dioxide
|
CO2
|
g
|
-393.5
|
Carbon monoxide
|
CO
|
g
|
-110.5
|
Hydrogen
|
H2
|
g
|
0
|
Water
|
H2O
|
g
|
-241.8
|
Water
|
H2O
|
l
|
-285.9
|
Chlorine
|
Cl2
|
g
|
0
|
Hydrogen chloride
|
HCI
|
g
|
-92.3
|
Hydrogen cyanide
|
HCN
|
g
|
+135.1
|
Methane
|
CH4
|
g
|
-74.9
|
Propane
|
C3H8
|
g
|
-103.8
|
n-Butane
|
C4H10
|
g
|
-124.7
|
n-Heptane
|
C7H16
|
g
|
-187.8
|
Benzene
|
C6H6
|
g
|
+82.9
|
Formaldehyde
|
CH2O
|
g
|
-115.9
|
Methanol
|
CH4O
|
g
|
-201.2
|
Methanol
|
CH4O
|
l
|
-238.6
|
Ethanol
|
C2H6O
|
L
|
-277.7
|
Ethylene
|
C2H4
|
g
|
52.5
|
aValues for gaseous substances not in equilibrium at the standard state have been determined from liquid and the heat of vaporization.
a) For products and reactants at 25°C, calculate the heat of combustion of benzene in kJ/mol.
b) For the reactants at 25°C, compute the adiabatic flame temperature in Kelvin of benzene burning in air at 200% theoretical air.
c) For the reactants at 25°C, compute the adiabatic flame temperature in Kelvin of benzene burning in pure oxygen. Assume 200% of the required stoichiometric oxygen is supplied (molar basis). Is this a realistic temperature? Explain your answer.
d) Why is there a difference between b) and c) above? Give a physical argument.
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Calculate the heat of combustion of benzene
: Benzene (C6H6) as a gas burns in air at 200% theoretical air. In answering the following parts, you may assume the products of combustion are CO2, H2O, O2, and N2. For products and reactants at 25°C, calculate the heat of combustion of benzene in ..
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