
(a) Against what external pressure must a gas sample expand from 50.0 mL to 219 mL to do 8.34 J of work? (b) To what volume will a 200.0-mL gas sample be compressed by an external pressure of 7.8 atm if 100.0 J of work are done on the system? (c) To what volume must a 200.0-mL gas sample expand against an external pressure of 7.8 atm to do 100.0 J of work?
(a)

Interpretation:
The external pressure and volumes has to be calculated.
Concept Introduction:
At constant pressure, the exchange of heat between the system and surroundings is called as Enthalpy and its state function.
Enthalpy can be given by the formula,
Where,
H=enthalpy
U=internal energy
P=Pressure
V=Volume
The work done on the system or by the system can be calculated from the equation
Where,
w=work done
P=Pressure
V=Change in volume
Answer to Problem 2PPB
The external pressure is
Explanation of Solution
To calculate the external pressure
Given data:
Initial volume =
Final volume =
Change in volume =
Work done =
(b)

Interpretation:
The external pressure and volumes has to be calculated.
Concept Introduction:
At constant pressure, the exchange of heat between the system and surroundings is called as Enthalpy and its state function.
Enthalpy can be given by the formula,
Where,
H=enthalpy
U=internal energy
P=Pressure
V=Volume
The work done on the system or by the system can be calculated from the equation
Where,
w=work done
P=Pressure
V=Change in volume
Answer to Problem 2PPB
The volume is
Explanation of Solution
To calculate the volume
Given data:
Initial volume =
Work done =
Pressure =
Final volume=
(c)

Interpretation:
The external pressure and volumes has to be calculated.
Concept Introduction:
At constant pressure, the exchange of heat between the system and surroundings is called as Enthalpy and its state function.
Enthalpy can be given by the formula,
Where,
H=enthalpy
U=internal energy
P=Pressure
V=Volume
The work done on the system or by the system can be calculated from the equation
Where,
w=work done
P=Pressure
V=Change in volume
Answer to Problem 2PPB
The volume is
Explanation of Solution
To calculate the volume
Given data:
Initial volume =
Work done =
Pressure =
Final volume=
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Chapter 10 Solutions
Chemistry: Atoms First
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