
(a)
Interpretation :
The amount of work that the water molecule did on the balloon must be calculated.
Concept Introduction :
Expansion work (W) of a gas can be written as
Pex, V2 and V1 are external pressure, final and initial volume respectively.
(a)

Answer to Problem SIII6RE
The amount of work that the water molecule did on the balloonis 167.15 J.
Explanation of Solution
Putting all the values it can be written as
1 L atm=101.3 J. It is used to get the work in J unit.
b)
Interpretation :
If there is anything else that needs to be taken into account when calculating the amount of work done by the water vapor must be explained.
Concept Introduction :
For ideal gas work done by the gas
b)

Answer to Problem SIII6RE
The gas inside the balloon must be an ideal gas.
Explanation of Solution
The water vapor transfer heat to the balloon. Then expansion of the gas inside the balloon takes place. Thus work was done by the water vapor to the balloon. This is an expansion work and the formula holds for an ideal gas only. Thus ideality of the gas inside the balloon needs to be taken into account when calculating the amount of work.
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