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During an experiment, a scientist tried to determine the molecular mass of a protein by applying…
During an experiment, a scientist tried to determine the molecular mass of a protein by applying elevation of boiling point method but did not succeed. When she used osmotic pressure method, she found that $20\text{ g}$ of protein in $2\text{ litres}$ solution had an osmotic pressure of $0\cdot0171\text{ atm}$ at $25^\circ\text{C}$.
(i)
Based on the findings of the scientist, calculate the molecular mass of protein.
($R = 0\cdot0821\text{ dm}^3\text{ atm K}^{-1}\text{mol}^{-1}$)
(ii)
Why was the scientist unsuccessful in determining the molecular mass by using elevation of boiling point method?
Answer
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From ISC 2026 Improvement Chemistry Paper 1, question 3.