Question

Which laws can be combined to form the ideal gas law?
Boyle’s law and Charles’s law
Gay-Lussac’s law and Avogadro’s law
Charles’s law, Avogadro’s law, and Boyle’s law
Dalton’s law, Gay-Lussac’s law, and Avogadro’s law

Answer 1

Charles’s law, Avogadro’s law, and Boyle’s law.

Reason: Boyle: P ∝ 1/V (at constant T, n).
Charles: V ∝ T (at constant P, n).
Avogadro: V ∝ n (at constant P, T).

Combine: V ∝ nT/P → PV ∝ nT → PV = nRT, the ideal gas law.