Posted by Lisa on Tuesday, November 9, 2010 at 12:27am.
You have two problems. The first is you didn't identify the gas with 265 mm Hg pressure. The second is you didn't ask a question. I will assume the 265 mm Hg gas is just X and I will assume the question is, "What is the pressure of He."
Ptotal = PX + PAr + PO2 + PHe.
Substitute and solve for PHe.
189 he?
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