
To find:
a) The fuel values of methanol and ethanol based on the thermochemical data in Appendix 4.
b) Does your answer support the prediction made in problem 19.80?

Answer to Problem 19.89QA
Solution:
a) Fuel value of methanol is
b) Yes; the answer supports the prediction made in problem 19.80.
Explanation of Solution
1) Concept:
To calculate the fuel value of the compound, we need to use the heat of combustion of fuel and molar mass. First we will write the combustion reaction of methanol and ethanol. Then we will calculate the
2) Formula:
i)
ii)
3) Given:
i)
ii)
iii)
iv)
v)
vi)
vii)
4) Calculations:
Write the balanced combustion reaction of methanol.
Calculate the
If we divide the absolute value of
The fuel value of methanol is
Write the balanced combustion reaction of ethanol.
Calculate the
If we divide the absolute value of
The fuel value of ethanol is
The fuel value of ethanol is higher than methanol. As the number of carbon atoms in the alcohol increases, the fuel value of alcohols increases.
Thus, the answer supports the prediction made in problem 19.80.
Conclusion:
The fuel value is calculated from the thermodynamic data, combustion reaction, and molar mass.
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Chapter 19 Solutions
CHEM:ATOM FOC 2E CL (TEXT)
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