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In 1997, at the United Nations Conference on Climate
Chapter 4, Problem 95P(choose chapter or problem)
Problem 95P
In 1997, at the United Nations Conference on Climate Change, the major industrial nations agreed to expand their research efforts to develop renewable sources of carbon-based fuels. For more than a decade, Brazil has been engaged in a program to replace gasoline with ethanol derived from the root crop manioc (cassava).
(a) Write separate balanced equations for the complete combustion of ethanol (C2H5OH) and of gasoline (represented by the formula C8H18).
(b) What mass of oxygen is required to burn completely 1.00 L of a mixture that is 90.0% gasoline (d = 0.742 g/mL) and 10.0% ethanol (d = 0.789 g/mL) by volume?
(c) If 1.00 mol of 02 occupies 22.4 L, what volume of O2 is needed to bum 1.00 L of the mixture?
(d) Air is 20.9% O2 by volume. What volume of air is needed to bum 1.00 L of the mixture?
Questions & Answers
QUESTION:
Problem 95P
In 1997, at the United Nations Conference on Climate Change, the major industrial nations agreed to expand their research efforts to develop renewable sources of carbon-based fuels. For more than a decade, Brazil has been engaged in a program to replace gasoline with ethanol derived from the root crop manioc (cassava).
(a) Write separate balanced equations for the complete combustion of ethanol (C2H5OH) and of gasoline (represented by the formula C8H18).
(b) What mass of oxygen is required to burn completely 1.00 L of a mixture that is 90.0% gasoline (d = 0.742 g/mL) and 10.0% ethanol (d = 0.789 g/mL) by volume?
(c) If 1.00 mol of 02 occupies 22.4 L, what volume of O2 is needed to bum 1.00 L of the mixture?
(d) Air is 20.9% O2 by volume. What volume of air is needed to bum 1.00 L of the mixture?
ANSWER:
Solution 95P
Step 1
(a) Here we have to write separate balanced equations for the complete combustion of ethanol (C2H5OH) and of gasoline (represented by the formula C8H18).
Combustion reaction: Combustion reaction involves heating of hydrocarbon in the presence of oxygen to produce carbon dioxide and water
The combustion reaction of ethanol has been carried out as follows,
C2H5OH (l) + 3O2 (g) → 2CO2 (g) + 3H2O (l)
The combustion reaction of gasoline has been carried out as follows,
2C8H18 (l) + 25O2 (g) → 16CO2 (g) + 18H2O (l)