Pure water at 20C is flowing at a volumetric flow rate of 314cm3/s in a tube coated with 10mm film of solid CaCO3. The length of the tube coated with CaCO3 is 1m, and the inner diameter of the tube is 2cm. The solubility of CaCO3 in water is 0.14mol/m3. Predict how long it will take for the CaCO3 coating to completely dissolve from the wall of the tube, assuming that bulk concentration of solute CaCO3 in the liquid stream is essentially zero throughout the 1m length of the scaled section. The following potentially useful data are available: Molecular weight of solute CaCO3=100g/mol Density of solid CaCO3=2.7103kg/m3 DAB, the diffusivity of solute CaCO3 in water =1.2109m2/s (20 marks)