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InterviewSolution
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A solution contains non-volatile solute of molecular mass`M_(2)`which of the following can be used to calculate the molecular mass of solute in terms of osmotic pressure? (`m_(2)` =mass of solute,V=volume of solution,`pi` =osmotic pressure)A. `M_(2)=(m_(2)/V)RT`B. `M_=(m_/V)(RT)/pi`C. `M_(2)=(m_(2)/V)piRT`D. `M_(2)=(m_(2)/V)pi/(RT)` |
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Answer» Correct Answer - 2 For dilute solutions, it has been found that the osmotic pressure is proportional to the molarity `(M)` of the solution at a given temperature `T`. Thus `pi=MRT` Here `pi` is the osmotic pressure and `R` is the gas constant. or `pi=n_(2)/V RT` where V is the volume of a solution in liters containing `n_(2)` moles of the solute. If `m_(2)` grams of solute, of molar mass, `M_(2)` is present in the solution, then `n_(2)=m_(2)//M_(2)` and we can write `pi=m_(2)/(M_(2)V)RT` or `M_(2)=(m_(2)/V) (RT)/pi` |
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