# If a #"62.4 g/L"# solution of bovine insulin in an appropriate solvent achieves an osmotic pressure of #"0.305 atm"# at #"298 K"#, estimate the molar mass?

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#a)# #"10000 g/mol"#

#b)# #"5000 g/mol"#

#c)# #"506887 g/mol"#

#d)# #"5069 g/mol"#

##### 1 Answer

#### Answer:

Formula Wt Insulin ~ 5000 g/mole*

#### Explanation:

Using the Osmotic Pressure Equation*

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Note: the method of mole weight analysis is not specified. That is, the 5808 mole wt. value is perhaps a weight average mole weight (mass fraction analysis), whereas the 5000 mole wt. calculation is based upon

The calculation using the osmotic pressure equation is correctly done but is a colligative property dependent relationship which will typically give lower values than other methods defining weight average mole weights.