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A quantity of 4.0 moles of an ideal gas ...

A quantity of 4.0 moles of an ideal gas at `20^(@)C` expands isothermally against a constant pressure of 2.0 atm from 1.0 L to 10.0L. What is the entropy change of the system (in cals)?

Text Solution

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The correct Answer is:
8
Expansion against constant pressure means the process is irreversible
`Delta S = nR l n (V_(2))/(V_(1)) = 4 xx 2 l n (10)/(1) = 18.424` cal
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Knowledge Check

  • One mole of an ideal gas for which C_(V)= 3//2R heated at a constant pressure of 1 atm from 25^(0)C "to" 100^(0)C What will be the amount of heat change at constant pressure?

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    B
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    C
    `-142.27` Cal
    D
    `-149.025` Cal

  • One mole of an ideal gas for which C_(V)= 3//2R is heated at a constant pressure of 1 atm from 25^(@) C " to" 100^(@)C What will be the amount of work done in the process?

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