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The work done per mole in an isothermal process is
  • a)
    RT log10 (V2/V1)
  • b)
    RT log10 (V1/V2)
  • c)
    RT loge (V2/V1)
  • d)
    RT loge(V1/V2)
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The work done per mole in an isothermal process isa)RT log10 (V2/V1)b)...
Work done is given by,
δW = nRT loge V2/V1
Form one mole
δW = RT loge V2/V
Free Test
Community Answer
The work done per mole in an isothermal process isa)RT log10 (V2/V1)b)...
Understanding Isothermal Processes
In an isothermal process, the temperature remains constant while a gas expands or contracts. The work done during this process can be derived from the first law of thermodynamics and the ideal gas law.
Work Done in Isothermal Process
- The formula for work done (W) when a gas expands or compresses is given by:
W = ∫ P dV
- For an ideal gas, pressure (P) can be expressed using the ideal gas equation:
P = nRT/V
- Substituting this into the work integral, we have:
W = ∫ (nRT/V) dV
- This integration occurs from the initial volume (V1) to the final volume (V2).
Integrating the Expression
- The work done then simplifies to:
W = nRT ∫ (1/V) dV from V1 to V2
- Performing this integral yields:
W = nRT [log(V2) - log(V1)]
- This can be further simplified using logarithmic properties:
W = nRT log(V2/V1)
Per Mole of Gas
- Since the question asks for the work done per mole, we set n = 1 (per mole):
W = RT log(V2/V1)
- To express this in terms of natural logarithms, we recognize that:
log(a/b) = log(a) - log(b)
Final Answer
- Thus, the correct expression for work done per mole during an isothermal process is:
W = RT loge(V2/V1)
This corresponds to option 'C', confirming that the work done is related to the natural logarithm of the volume ratio during an isothermal expansion or compression.
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