Total pressure of O2 and He(PT) = 3.20atm
The partial pressure of O2 = 0.17atm
partial pressure (PHe) = PT-PO2
= 3.20-0.17
= 3.03atm
PHe = 3.03atm
V = 10L
T = 23+273 = 296K
PV = nRT
n = PV/RT
= 3.03*10/(0.0821*296)
= 1.25moles
mass of He = no of moles * gram atomic mass
= 1.25*4
= 5g >>>.answer
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