he combustion of ethanol (C 2 H 5 OH) is shown below: C 2 H 5 OH + 3 O 2 (g) 2 C
ID: 522177 • Letter: H
Question
he combustion of ethanol (C2H5OH) is shown below:
C2H5OH + 3 O2 (g) 2 CO2 (g) + 3 H2O(l) Hrxn = -1367.4 kJ
The ethanol can also react with oxygen to form acetic acid. The reaction is:
C2H5OH + O2 (g) CH3COOH + H2O(l)
The heats of formation of CH3COOH, CO2 and H2O are listed below, C(s) is graphite:
H = -241.8 kJ/mol
Determine the H of combustion of 11.3 g of ethanol.
-335 kJ
Determine the H of formation of ethanol in kJ
Determine the H of the reaction of acetic acid formed from ethanol in kJ
2 H2 (g) + 2 C(s) + O2 (g) CH3COOH(l) H = -484 kJ/mol C(s) + O2 (g) CO2 (g) H = -393.5 kJ/mol H2(g) + 1/2 O2 (g) H2O (l) H = -285.8 kJ/mol H2(g) + 1/2 O2 (g) H2O (g)H = -241.8 kJ/mol
Explanation / Answer
Determine the H of combustion of 11.3 g of ethanol.
-335 kJ
Molar mass of ethanol = 46.06844 g/mol
Mole of ethanol = 11.3 g / 46.06844 g/mol= 0.246 moles
-1367.4 kJ / 1 mole * 0.246 moles
= 336.4 kJ
Determine the H of formation of ethanol in kJ
C2H5OH + O2 (g) CH3COOH + H2O(l)
2 H2 (g) + 2 C(s) + O2 (g) --- > CH3COOH(l) H = -484 kJ/mol
C2H5OH + 3 O2 (g) ---- > 2 CO2 (g) + 3 H2O(l) Hrxn = -1367.4 Kj
2 H2O (l)--- >2 H2(g) + O2 (g) H = 571.6 kJ/mol
2CO2 (g) ---- > 2C(s) + 2O2 (g) H = +787 kJ/mol
C2H5OH + O2 (g) ---- > CH3COOH + H2O(l)
H = -492.8 kJ/mol
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