1.PV = nRT
n = W/M
PV = WRT/M
P = 720/760 = 0.947atm
T = 32+273 = 305K
V = 0.45L
M = 44g/mole
W = PVM/RT
=
0.947*0.45*44/0.0821*305 = 0.75g
2.PM = dRT
d = 6.29g/L
P = 1atm
T = 25+273 = 298K
M = dRT/P
= 6.29*0.0821*298/1 =
154g/mole
3. no of moles of He = 14.2/4 = 3.55moles
no of moles of Ar = 36.7/40 = 0.9175 moles
total no of moles of He,Ar(n)= 3.55+0.9175 =
4.4675moles
v = 0.1L
T = 290K
PV
=nRT
P =
nRT/V
= 4.4675*0.0821*290/0.1 = 1063.66atm
mole fraction of He = no of moles He/total no of
moles
= 3.55/4.4675 = 0.794
mole fraction of Ar = no of moles He/total
no of moles
= 0.9175/4.4675 = 0.2053
partial pressure of He = mole frarion of He *
total pressure
= 0.794*1063.66 = 844.54atm
partial pressure of Ar = mole frarion of Ar *
total pressure
= 0.2053*1063.66 = 218.36atm
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