Chemical Engineering Thermodynamics
Boyle's law for gases states that

P ∝ V, at constant temperature & mass of the gas
P/V = constant, for any gas
P ∝ 1/V, when temperature & mass of the gas remain constant
P ∝ 1/V, when temperature is constant

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Chemical Engineering Thermodynamics
Gibbs-Duhem equation

Finds no application in gas-liquid equilibria involved in distillation
States that n₁dμ₁ + n₂dμ₂ + ....njdμj = 0, for a system of definite composition at constant temperature and pressure
None of these
Applies only to binary systems

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