Dalton's law of partial pressures states that the total pressure of a mixture of gases equals
- A. the product of the individual pressures
- B. the sum of the partial pressures of the component gases
- C. the average of the individual pressures
- D. the pressure of the heaviest gas
Explanation
Because ideal gas molecules do not interact, each gas exerts the pressure it would exert alone in the same volume, and these simply add. The partial pressure of a component is its mole fraction multiplied by the total pressure. This is how the composition of air and of respiratory gas mixtures is described.
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