Ideal Gas Law and Differentiation

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SUMMARY

The discussion centers on the application of the Ideal Gas Law, specifically the equation PV = nRT, to calculate the rate of change of the number of moles (n) with respect to the rates of change of pressure (P) and temperature (T) while holding volume (V) constant. Participants confirm that while R and V are constants, n can vary over time, and differentiation can be applied to derive the relationship. The derived formula $$\frac{d\ln{n}}{dt}=\frac{d\ln{P}}{dt}-\frac{d\ln{T}}{dt}$$ is established as a valid method for this calculation.

PREREQUISITES
  • Understanding of the Ideal Gas Law (PV = nRT)
  • Basic calculus, specifically differentiation
  • Knowledge of logarithmic functions
  • Familiarity with the concept of rates of change in physics and chemistry
NEXT STEPS
  • Study the application of differentiation in thermodynamics
  • Explore the implications of the Ideal Gas Law in real-world scenarios
  • Learn about the behavior of gases under varying pressure and temperature conditions
  • Investigate the relationship between moles, pressure, and temperature in closed systems
USEFUL FOR

Students and professionals in chemistry and physics, particularly those focusing on thermodynamics and gas laws, as well as educators teaching these concepts.

Siddharth Rajvanshi
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Is it possible to calculate the rate of change of n with respect to rate of change of Pressure and rate of change of Temperature with V unknown but constant by PV = nRT?

Rate of change of Pressure and rate of change of temperature can be measured. R and V are constants.
 
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Are you assuming that ##n## varies in time and is not constant ?
 
It seems to be possible with simple differentiation. However 'n' must be known at the point of time.
 

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$$\frac{d\ln{n}}{dt}=\frac{d\ln{P}}{dt}-\frac{d\ln{T}}{dt}$$
 

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