density of di-n-butyl phthalate(d) = 1.046g/ml
The pressure of di-n-butyl phthalate = 685mm
density of mercury(d2) = 13.53g/ml
d1/d2 = h2/h1
1.046/13.53 = h2/685
h2 = 1.046*685/13.53 = 53mm
[1mmHg = 1 torr]
53torr >>>answer
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