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Heptane and octane are mixed to form an ...

Heptane and octane are mixed to form an ideal liquid solution. At certain temperature total vapour pressure in `(kPa)` of a mixture of volatile components heptane and octane is given by
`P_("total")=120-76x_("Octane")`
If total vapour pressure over liquid solution is `63kPa`
Mole fraction of octane is distillate is

A

IV,i,R

B

IV,ii,P

C

IV,iv,P

D

I,iv

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