The partial pressure of the helium is 0.22 atm.
What is partial pressure?
The term partial pressure has to do with the individual pressure of a gas which is part of a mixture of gases.
In this case, we have the gases; neon and argon and helium. We have the partial pressures of argon and argon hence the partial pressure of the helium is; 1.25 - (0.68 +0.35) = 0.22.
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