CHEM 1407 CHM
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# 5/12 4. (26 points) Consider the complete combustion reaction in a car engine, as presented in class, except now you are considering the combustion...

5/12
4. (26 points) Consider the complete combustion reaction in a car engine, as presented in
class, except now you are considering the combustion of gaseous ethanol, where one of
your products is gaseous water. Air is taken into the cylinder of your car under constant
pressure conditions (atmospheric pressure), filling the cylinder to an initial volume of
55.0 ml at 298 K.
*For this problem, check the equations sheet for some useful constants.
a. (2 points, NO partial credit) Write the balanced chemical reaction for the
combustion of gaseous ethanol where gaseous water is one of the products.
b. (4 points) Calculate the change in enthalpy for this reaction under standard
conditions.
c. (6 points) Given that air is 21.0% Oz (Xoz = 0.210), how much heat is released
from the complete combustion of the O, available in the cylinder (assume O, is

4. 16 points ) What partial pressure of ethanol ( in atm ) is required for the complete
combustion of the O , in the cylinder ( to react stoichiometrically ! ? Remember :&quot;
You must show work or explain your logic to receive credit .`
Alternative : If you cannot determine how to calculate the number of males of O , You
may use 1. OXID' mores O , to calculate in part id) . If you do this correctly , You will
c . 18 points ) After combustion , there are 0. 072 2 { of gas molecules in the cylinder .
What change in volume ( in mill does the cylinder experience due to this*
combustion reaction ? The specific heat capacity of the gas molecules in the
cylinder Is 1.012 1 /8* *`

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