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Mole fraction of toluene in the vapour phase which is in equilibrium with a solution of benzene (`p^0=120` torr) and toluene (`p^0 = 80` torr) having 2.0 mole of each is:
A. |
0.50 |
B. |
0.25 |
C. |
0.60 |
D. |
0.40 |
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