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How can you calculate the pressure of dry gas when it is collected over water?

Options

  1. ABy subtracting the total pressure from the aqueous tension
  2. BBy adding the vapour pressure of water to the total pressure
  3. CBy subtracting the aqueous tension from the total pressure
  4. DBy multiplying the total pressure by the vapour pressure of water

Correct answer

C. By subtracting the aqueous tension from the total pressure

Step-by-step solution

The pressure of dry gas is calculated by subtracting the aqueous tension from the total pressure of the moist gas.

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