The mass of a non-volatile, non-electrolyte solute (molar mass=50 g ) needed
to be dissolved in 114 g octane to reduce its vapour pressure to 75%, is :
37.5 g
75 g
150 g
50 g
As we have learned
Expression of relative lowering of vapour pressure -
- wherein
wt= 50/3
Option 1)
37.5 g
This is incorrect
Option 2)
75 g
This is incorrect
Option 3)
150 g
This is incorrect
Option 4)
50 g
This is incorrect
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