Amixture of three noble gases has a total pressure of 1.25 atm. the individual pressures exerted by neon and argon are 0.68 atm and 0.35 atm, respectively. what is the partial pressure of the third gas, helium?
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The partial  pressure  of the third gas (Helium)  is  0.22 atm

 calculation

Total pressure= partial pressure  for neon +  partial pressure for argon + partial pressure for helium

partial pressure for neon= 0.68 atm

partial pressure for argon = 0.35 atm

partial pressure for  helium = ? atm

make the partial pressure of helium the subject of the formula

Partial pressure of  Helium=  total pressure - ( partial pressure of neon +partial pressure for Helium )

=  1.25 atm - (0.68 +0.35 )  =0.22 atm

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