a pressurized tank for diving is filled with 4.0L gas
which constitutes of 50g of O2 and 150g of N2 . Calculate the
partial pressure for each gas and total gas pressure.
moles of O2 = 50 / 32 = 1.56
moles of N2 = 150 / 28 = 5.36
total moles = 5.36 + 1.56 = 6.92
mole fraction of O2 = moles of O2 / total moles = 1.56 / 6.92 = 0.225
mole fraction of N2 = 0.775
V = 4.0 L
T = 298 K
P V = n RT
P x 4 = 6.92 x 0.0821 x 298
P = 42.33 atm
total pressure =42.33 atm
partial pressure of O2 = mole fraction x total pressure
= 0.225 x 42.33
= 9.52 atm
partial pressure of O2 =9.52 atm
partial pressure of N2 = 0.775 x 42.33
partial pressure of N2 = 32.80 atm
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