4. HW. For a spherical drop of acetone 3mm in radius at a temperature of 318K and pressure of 101.325kPa, where the partial pressure of acetone PAl is 67.46kPa and the air is assumed to be still with a zero velocity. For acetone, density, =790kg/m3, molecular weight =58.08kg/kgmole. The diffusivity of acetone in air is 1.24x105 m2/s at 293K and 1atm. pressure. a. Calculate the time of complete evaporation b. What will be the time of complete evaporation if the evaporation takes place at 293K and 1atm. pressure, where the partial pressure of acetone PAl is 24.44k Pa? c. Using time of complete evaporation obtained in case (a), what % of the mass will be evaporated in case (b)? 4. HW. For a spherical drop of acetone 3mm in radius at a temperature of 318K and pressure of 101.325kPa, where the partial pressure of acetone PAl is 67.46kPa and the air is assumed to be still with a zero velocity. For acetone, density, =790kg/m3, molecular weight =58.08kg/kgmole. The diffusivity of acetone in air is 1.24x105 m2/s at 293K and 1atm. pressure. a. Calculate the time of complete evaporation b. What will be the time of complete evaporation if the evaporation takes place at 293K and 1atm. pressure, where the partial pressure of acetone PAl is 24.44k Pa? c. Using time of complete evaporation obtained in case (a), what % of the mass will be evaporated in case (b)