Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Answer Question number 6
![4Gılll Gilll
00:21
* 67%
f [Template] Mo... /
Answer the following problems:
1. Two solid objects, A and B, are placed in boiling water and allowed to come to
the temperature of the water. Each is then lifted out and placed in separate
beakers containing 1000 g of water at 10.0 °C. Object A increases the water
temperature by 3.50 °C; B increases the water temperature by 2.60 C.
a. Which object has the larger heat capacity?
b. What can you say about the specific heats of A and B?
2. The specific heat of octane, CsHss0), is 2.22 Jig-K.
a. How many J of heat are needed to raise the temperature of 80.0 g of
octane from 10.0 to 25.0 °C?
b. Which will require more heat, increasing the temperature of 1 mol of
CH18, by a certain amount or increasing the temperature of 1 mol of
HOm by the same amount?
3. Calculate the enthalpy change for the reaction
P.0a (4) + 2 02 (0) - P,010(5)
given the following enthalpies of reaction:
AH = -1640.1 k)
Pa (s) + 302 (9) - P,0.4)
Pa (s) + 5 02 (9) - P,010 (9)
AH = -2940.1 k)
4. From the enthalpies of reaction
H2 (9) + F2 (0) - 2 HF)
C9 +2 F2 (0) - CF. (6)
2 C) +2 H2 (0) - CHa (0)
AH = -537 k)
AH = -680 k/
AH = +52.3 k)
calculate AH for the reaction of ethylene with F2:
12
THERMOCHEMISTRY
...
CH4 (9) + 6 F2 (9) + 2 CF, () + 4 HF)
5. Gasoline is composed primarily of hydrocarbons, including many with eight
carbon atoms, called octanes. One of the deanest-buming octanes is a
compound called 2,3,4- trimethylpentane, which has the following structural
formula:
сн, сн, сн,
H;C-CH-CH-CH-CH,
The complete combustion of one mole of this compound to COzig and H2Og
leads to AH° = -5064.9 k).
a. Write a balanced equation for the combustion of 1 mol of CaH18n.
b. By using the information in this problem and data in the thermodynamic
properties table, calculate AH for 2,3,4-trimethylpentane.
6. The following is known as the thermite reaction:
2 Alg + Fe,0s(4) - Al,03(9) + 2 Feg)
This highly exothermic reaction is used for welding massive units, such as propellers for
large ships. Using standard enthalpies of formation, calculate AH° for this reaction.
I hope you'll enjoy the task
Answer Key](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb59a689e-7f86-4e73-87b2-4001b6c913ab%2F39678979-c316-4c6d-ba3b-6ca7fc613f57%2Fl17g76h_processed.jpeg&w=3840&q=75)
Transcribed Image Text:4Gılll Gilll
00:21
* 67%
f [Template] Mo... /
Answer the following problems:
1. Two solid objects, A and B, are placed in boiling water and allowed to come to
the temperature of the water. Each is then lifted out and placed in separate
beakers containing 1000 g of water at 10.0 °C. Object A increases the water
temperature by 3.50 °C; B increases the water temperature by 2.60 C.
a. Which object has the larger heat capacity?
b. What can you say about the specific heats of A and B?
2. The specific heat of octane, CsHss0), is 2.22 Jig-K.
a. How many J of heat are needed to raise the temperature of 80.0 g of
octane from 10.0 to 25.0 °C?
b. Which will require more heat, increasing the temperature of 1 mol of
CH18, by a certain amount or increasing the temperature of 1 mol of
HOm by the same amount?
3. Calculate the enthalpy change for the reaction
P.0a (4) + 2 02 (0) - P,010(5)
given the following enthalpies of reaction:
AH = -1640.1 k)
Pa (s) + 302 (9) - P,0.4)
Pa (s) + 5 02 (9) - P,010 (9)
AH = -2940.1 k)
4. From the enthalpies of reaction
H2 (9) + F2 (0) - 2 HF)
C9 +2 F2 (0) - CF. (6)
2 C) +2 H2 (0) - CHa (0)
AH = -537 k)
AH = -680 k/
AH = +52.3 k)
calculate AH for the reaction of ethylene with F2:
12
THERMOCHEMISTRY
...
CH4 (9) + 6 F2 (9) + 2 CF, () + 4 HF)
5. Gasoline is composed primarily of hydrocarbons, including many with eight
carbon atoms, called octanes. One of the deanest-buming octanes is a
compound called 2,3,4- trimethylpentane, which has the following structural
formula:
сн, сн, сн,
H;C-CH-CH-CH-CH,
The complete combustion of one mole of this compound to COzig and H2Og
leads to AH° = -5064.9 k).
a. Write a balanced equation for the combustion of 1 mol of CaH18n.
b. By using the information in this problem and data in the thermodynamic
properties table, calculate AH for 2,3,4-trimethylpentane.
6. The following is known as the thermite reaction:
2 Alg + Fe,0s(4) - Al,03(9) + 2 Feg)
This highly exothermic reaction is used for welding massive units, such as propellers for
large ships. Using standard enthalpies of formation, calculate AH° for this reaction.
I hope you'll enjoy the task
Answer Key
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