The expression for moles of CHCl3 is given as, n=‌
mCHCl3
MCHCl3
Here, the mass of CHCl3 is mCHCl3 and its molar mass is MCHCl3 Substitute the given value in above formula we get, n=‌
59.75g
119.5g⋅mol−1
=0.5mol The expression for moles of CH2Cl2 is given as, n=‌
mCH2Cl2
MCH2Cl2
Here, the mass of CH2Cl2 is mCH2Cl2 and its molar mass is MCH2Cl2 Substitute the given value in above formula we get, n=‌
21.25g
85g⋅mol−1
=0.25mol The mole fraction of CH2Cl2 is given as: χCH2Cl2=‌
nCH2Cl2
nCH2Cl2+nCHCl3
χCH2Cl2=‌
0.25
0.25+0.5
=0.33 The mole fraction of CHCl3 is given as χCHCl3=1−χCH2Cl2 χCHCl3=1−0.33=0.67 The mole fraction of CHCl3 in vapour phase is given as, yCHCl3=‌
pCHCl3
p10+(p20−p10)x2
yCHCl3=‌
134mm
200+(415−300)0.33
yCHCl3=0.494 The mole fraction of CH2Cl2 in vapour phase is given as yCH2Cl2=‌