Finding the change in pressure and entropy of a quasistatic adiabatic process

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SUMMARY

The discussion focuses on calculating the change in pressure and entropy for one mole of an ideal monatomic gas undergoing a quasi-static adiabatic expansion from an initial state of P1 = 1 Pa and V1 = 1 m³ to a final volume of V2 = 8 m³. The relevant equation used is PVγ = constant, where γ (gamma) for a monatomic ideal gas is 5/3. The challenge lies in deriving a second equation without introducing additional unknowns, emphasizing the need for clarity on the assumptions regarding the gas type.

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  • Knowledge of thermodynamic processes, specifically adiabatic processes
  • Familiarity with the concept of heat capacity ratios (γ)
  • Basic skills in algebraic manipulation of equations
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Homework Statement


Suppose that one mole of an ideal gas expands in a quasi-static adiabatic process from P1 = 1 Pa and V1 = 1m3 to V2 = 8m3. What is the change in the pressure and the entropy of the gas?


Homework Equations



PV\gamma=constant

The Attempt at a Solution


I can't come up with a second equation that doesn't introduce another unknown. I've been working on thermodynamics for the past two days almost non-stop and I'm drained. Any help would be nice. thanks.
 
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perhaps I am supposed to assume that the gas is monoatomic? My textbook is vague and its not clear to me whether all ideal gasses are considered monoatomic.

this is what i found:

\gamma= 5/3 (ideal monatomic gas).
 

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