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Variations on Ideal Gas Equation

  • During chemical and physical processes, any of the four variables in the

ideal gas equation may be fixed.

Thus, PV=nRT can be rearranged for the fixed variables:

  • for a fixed amount at constant temperature

  • PV = nRT = constant

Boyle’s Law

  • for a fixed amount at constant pressure

  • V/T = nR/P = constant

Charles’ Law

  • for a fixed pressure and temperature

    • V = n (RT/P) or V n Avogadro’s Law

  • for constant volume

    • P/T = nR/V = constant when amount constant

    • P = nRT/V so P n when T constant

JUST REMEMBER PV = nRT and rearrange as needed

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