We want to determine the vapor pressure (VP) of an ideal solution of A and B at

Question

We want to determine the vapor pressure (VP) of an ideal solution of A and B at 35 degrees C. In order to calculate this, which parameters are most critical for this determination?

a. VP of both A and B at 35 degrees and the volume of both A and B

b. VP of both A and B at their respective boiling points and the number of moles of both A and B present

c. VP of both A and B at their respective boiling points and volume of both A and B present

d. VP of both A and B at 35 degree C and the number of moles of both A and B present

Explanation / Answer

ANS : D

Reason , for vapor pressure calculation of an ideal mixture

the formula is

vapor pressure of mixture P= Xa*Pa       +    Xb*Pb

where Xa= moles of (a)/[moles of( a) + moles of( b) ]

and Xb= moles of (b)/[moles of( a) + moles of( b) ]

so moles of a and b are required to calculate above

and Pa= vapor pressure of pure( a) at temperature at which we want to measure P

     Pb=vapor pressure of pure (b) at temperature at which we want to measure P

temperature here is 35 C so we want Pa and Pb at 35 C

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