Dalton's law of partial pressures states that the total pressure of a mixture of gases equals
Correct answer: B. the sum of the partial pressures of the component gases
- 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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About Ideal Gas Equation
The ideal gas equation, PV = nRT, relates pressure, volume, amount and absolute temperature when gas particles are assumed to have negligible volume and no intermolecular forces. Applications include finding molar mass, density or an unknown gas variable, with careful use of Kelvin temperature and consistent units, and comparison with real-gas behaviour.
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