General Chemistry Chem 101 Homework Review

 
Homework 5
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:
 
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:
 
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1
 
A gas expands from 264 mL to 971 mL at constant temperature. Calculate
the work done (in joules) by the gas if it expands (a) against a vacuum and
(b) against a constant pressure of 4.00 atm.
 
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2
 
A gas expands and does 
P
-
V 
work on the surroundings equal to 279 J. At
the same time, it absorbs 216 J of heat from the surroundings. What is the
change in energy of the system?
 
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3
 
Calculate the heat evolved when 266 g of white phosphorus (P
4
) burns in
air according to the equation
 
P
4
(
s
)
 
+
 
5
O
2
(
g
)
 
 
P
4
O
1
0
(
s
)
 
 
 
 
 
 
 
 
H
 
=
 
-
3
0
1
3
 
k
J
/
m
o
l
 
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4
 
An iron bar of mass 869 g cools from 94°C to 5°C. Calculate the heat
released (in kilojoules) by the metal. Specific heat of iron = 0.444 J/g
o
C
 
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5
 
Calculate the standard enthalpy of formation of carbon disulfide (CS
2
) from
its elements, given that
 
The standard enthalpy equation for CS
2
 is:
C(graphite) + 2S(rhombic) → CS
2
(l)
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This homework assignment covers various topics in general chemistry, including gas expansion work calculations, heat transfer, enthalpy of formation, and specific heat calculations. Each question presents a different scenario for students to apply their knowledge and problem-solving skills. The questions range from determining work done by a gas expanding against different pressures to calculating heat released during a cooling process. Additionally, it includes the calculation of the standard enthalpy of formation of carbon disulfide. These problems are designed to test understanding and application of fundamental principles in chemistry.


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  1. General Chemistry Chem 101 Homework 5 Name: ID Number: Section:

  2. Question 1 A gas expands from 264 mL to 971 mL at constant temperature. Calculate the work done (in joules) by the gas if it expands (a) against a vacuum and (b) against a constant pressure of 4.00 atm.

  3. Question 2 A gas expands and does P-V work on the surroundings equal to 279 J. At the same time, it absorbs 216 J of heat from the surroundings. What is the change in energy of the system?

  4. Question 3 Calculate the heat evolved when 266 g of white phosphorus (P4) burns in air according to the equation P4(s) + 5O2(g) P4O10(s) H = -3013 kJ/mol

  5. Question 4 An iron bar of mass 869 g cools from 94 C to 5 C. Calculate the heat released (in kilojoules) by the metal. Specific heat of iron = 0.444 J/goC

  6. Question 5 Calculate the standard enthalpy of formation of carbon disulfide (CS2) from its elements, given that The standard enthalpy equation for CS2 is: C(graphite) + 2S(rhombic) CS2(l)

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