The partial pressure of the third gas, helium will be [tex]P_h=0.22\ atm[/tex]
According to Dolton's law of partial pressure if the mixture of gases exists in a container then the total pressure exerted by the gas will be the sum of the partial pressure of each case.
Now from the question, it is given
The total pressure of the three noble gases [tex]P_t=1.25\ atm[/tex]
The individual pressure of Neon= 0.68 atm
The individual pressure of argon=0.35 atm
The partial pressure of the third gas will be:
[tex]P_t=P_A+P_N+P_H[/tex]
[tex]P_H=P_T-P_A-P_N[/tex]
[tex]P_H=1.25-0.68-0.35=0.22\ atm[/tex]
Hence the partial pressure of the third gas, helium will be [tex]P_h=0.22\ atm[/tex]
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