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Helium gas is collected over water at 25◦c. what is the partial pressure of the helium, given a barometric pressure of 720 mm hg? answer in units of mm hg.

Respuesta :

The total pressure in the container is thus 720 mmHg which is given by the sum of the partial pressure of helium plus pressure of water;
That is; P (helium) + P (water) = P (total)
Therefore; P (helium) = P (total) - P (water) 
Assuming the pressure of water at 25 °C is 23.76 mm Hg
Hence; P (helium) = 720 - 23.76 
  = 696.24 mm Hg    

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