P16B.1 The viscosity of benzene varies with temperature as shown in the following table. Use the data to infer the activation energy associated with viscosity. 0/°C 10 20 30 40 50 60 70 n/cP 0.758 0.652 0.564 0.503 0.442 0.392 0.358
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- Polymer PXX has a glass transition temperature of 49°C What inter-molecular interactions are present and what is the consequent effect upon molecular motion?Microemulsions have an extremely high interfacial area between the two phases. Explain how this property contributes to their spontaneous formation when the appropriate combination of components are combined.4. Estimate the effective radius of a sucrose molecule in water at 25°C given that its diffusion coefficient is 5.2 x 10-10m²/s and the viscosity of water is 0.0100P.
- Carbon tetrachloride melts at 250. K. The vapor pressure of the liquid is 10,539 Pa at 290 K and 74,518 Pa at 340 K. The vapor pressure of the solid is 270 Pa at 232 K and 1092 Pa at 250 K.(c) The data set below represents the surface tension data for aqueous solutions of 3- methylbutanoic acid [(CH3)2CHCH₂COOH] at 25°C. [C] [mol.dm³] 0 Y[mN.m'] 72.7 0.009 64.6 0.026 59.0 0.065 51.3 0.135 47.0 (i) Calculate the surface excess of 3-methylbutanoic acid (in mol.m2) and (ii) Hence estimate the molecular cross sectional area (in nm²) for this surface active molecule. (iii) Compare your estimate with the molecular cross sectional area one might expect for n-butanoic acid and account for the difference, if any, between the two surface active molecules.-10 m² s 6. [15] The diffusion coefficient of sucrose molecule in water is 5.22x107 at 25°C. How long does it take for a sucrose molecule to diffuse a) 1 mm, b) 1 cm, c) 1 m from its starting point in a sample of unstirred water? What is the flux of the sucrose molecules down a concentration gradient of 0.1 mol L-¹ m² ¹?
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