4. In order to determine the molecular weight of rubber, its osmotic pressure was measured in benzene (1) and in mixed solvents: benzene - isoamyl alcohol (2), benzene - methyl alcohol, benzene - hexyl alcohol (4). Based on the table data, calculate the molecular weight of rubber and answer the question - does the limiting value of the reduced osmotic pressure depend on the type of solvent. Experiment temperature 27.5 C
C, kg/m3 2.5 5.0 7.5 10.0 12.50
P/C, m-1
1) 15.60 18.64 22.30 26.80 32.40
2) 15.10 17.63 20.26 23.60 –
3) 14.20 15.60 17.30 19.50 22.30
4) 13.60 14.20 15.00 15.90 17.20

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