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Ethanol, $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH},$ is used as a fuel for motor vehicles, particularly in Brazil(a) Write the balanced equation for the combustion of ethanol to $\mathrm{CO}_{2}(g)$ and $\mathrm{H}_{2} \mathrm{O}(g),$ and, using the data in Appendix G, calculate the enthalpy of combustion of 1 mole of ethanol.(b) The density of ethanol is 0.7893 $\mathrm{g} / \mathrm{mL}$ . Calculate the enthalpy of combustion of exactly 1 $\mathrm{L}$ of ethanol.(c) Assuming that an automobile's mileage is directly proportional to the heat of combustion of the fuel, calculate how much farther an automobile could be expected to travel on 1 1 $\mathrm{L}$ of gasoline than on 1 of ethanol. Assume that gasoline has the heat of combustion and the density of n-octane, $\mathrm{C}_{8} \mathrm{H}_{18}\left(\Delta H_{\mathrm{f}}^{\circ}=-208.4 \mathrm{kJ} / \mathrm{mol} ; \text { density }=0.7025\right.$ $\mathrm{g} / \mathrm{mL}$ .

aThis value mean that 1 mol of ethanol produce 1234.88 $\mathrm{kJ}$ of heat.b$$q=-21153.49 \mathrm{kJ}$$ c. If automobile's mileage is directly proportional to heat that is released in reaction and $n$ -octane release larger amount of heat we can conclude that automobile will pass greater distance with 1 L of $n$ -octane then with 1 L of ethanol. Automobile will pass 1.487 times greater distance with $n$ -octane then with ethanol.

Chemistry 101

Chapter 5

Thermochemistry

Drexel University

University of Toronto

Lectures

02:29

Chemistry is the science o…

04:42

In chemistry and physics, …

05:11

Ethanol $\left(\mathrm{C}_…

18:37

The automobile fuel called…

03:00

Most cars in the United St…

01:22

13:55

08:08

Ethanol $\left(\mathrm{CH}…

08:16

03:57

04:06

Ethanol, $\mathrm{C}_{2} \…

01:19

The combustion of liquid e…

In Brazil automobiles use …

10:14

03:02

14:11

The complete combustion of…

01:21

01:49

Find H for the combustion…

01:24

Gasohol is a mixture of et…

04:28

05:08

The enthalpy of formation …

caution number 80 First, we need to learn the definition. The intel A P off reaction is calculated by subtracting this sum off until your formation from the some off and tell pee off formation off products. It's represented by the given equation Over here. Here, Delta Etch off product Is the entire pier formation off products? Where did the Etch reactions is for the entire be information for reactions? But a off the question given we have a balanced reaction for compassion off eternal representing over here? No, we calculate the entire P off conversion off one mole off eternal, substituting all the values that are given in the equation then that are given in the cushion in tow. This equation we have Delta H for reaction, which turns out to be negative off 1234.8. Kill a Jew from mole. Therefore, one mole off eternal. Have a combustion in Talebi, but be the relation between density on. The volume is here as follows. Weaken Deering's tohave volume, substituting the moss on the density toe. Get the volume into leaders, which turns out to be 0.5875 liters now the heat absorbed, but leader is calculated it using this aggression. Let's mark it as number two on dhe. This one lets market as number one, substituting the values we can calculate the heat absorbed as negative, off 2.117 into 10 days to par four kilo. Jules, therefore then tell people can compassion off one leader off Eternal is negative off 2.117 to 10 days of our folk. Hello, Jules. Next for part C, we have the given reaction. The heat off compassion can be calculated by the representational here, substituting in the values into the equation. We have heat off compassion that turns out to be negative off 5116.1 collegial per book here again substituting the values. It's 5116.1 kilo. Jule Formal, The Moler Mass off C eight. Etch eight is 114 point duty Grandpa removed the relationship between density and volume as earlier Reform Road is represented. Over here, we can rearrange that formula toe have all new substituting in the values. From the caution we have, William with stones out, Toby 0.16 to six leaders. Now the heat absorbed per liter can be calculated, which turns out to be negative off three point 146 into 10 days to bar four collegial per liter. Now, the issue off heat produced by leader off gasoline by eternal, can be calculated by just dividing each other, which turns out to be 1.45 Therefore, gasoline can make an automobile travel 1.45 times faster than the eternal.

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