The sum of the partial pressures of a gas mixture equals the total gas pressure of the system. This statement represents which of the following laws?

a. Dalton's law
b. Avogadro's law
c. The combined-gas law
d. Boltzmann's Universal Gas Constant

ANS: A
The correct answer is Dalton's law. This law states that the total pressure of a gas is equal to the sum of the partial pressure of the gases that make up the mixture. The par-tial pressure of a gas within a gas mixture can be calculated by multiplying the total pressure of the mixture by the percentage of the mixture it occupies.