question 2 consider a hemispherical droplewof iniquid water residing on a flat surface figure st

Step 1: Understand the problem and gather the given data. We need to find the total evaporation

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Question 2: Consider a hemispherical droplet of liquid water residing on a flat surface, as shown in figure 1. Still air surrounds the droplet. At an infinitely long distance from the gas film, the concentration of water vapor in the air approaches zero. At a constant temperature of 30°C and 1.0 atm total system pressure, the evaporation rate of the droplet is 258464 mmole H2O per hour and the rate of molecular diffusion in the air is 38985 cm^2/s. The vapor pressure of water at 30°C is 0.042 atm, and the molecular diffusion coefficient of H2O vapor in air at 1.0 atm and 30°C is 0.266 cm^2/s. What is the total evaporation transfer rate in units of mmole H2O per hour from a water droplet of radius 5.0 mm? Determine the time it will take for the water droplet to completely evaporate at 30°C and 1.0 atm total system pressure if the initial droplet radius is 5.0 mm.

          Question 2: Consider a hemispherical droplet of liquid water residing on a flat surface, as shown in figure 1. Still air surrounds the droplet. At an infinitely long distance from the gas film, the concentration of water vapor in the air approaches zero. At a constant temperature of 30°C and 1.0 atm total system pressure, the evaporation rate of the droplet is 258464 mmole H2O per hour and the rate of molecular diffusion in the air is 38985 cm^2/s. The vapor pressure of water at 30°C is 0.042 atm, and the molecular diffusion coefficient of H2O vapor in air at 1.0 atm and 30°C is 0.266 cm^2/s. What is the total evaporation transfer rate in units of mmole H2O per hour from a water droplet of radius 5.0 mm? Determine the time it will take for the water droplet to completely evaporate at 30°C and 1.0 atm total system pressure if the initial droplet radius is 5.0 mm.

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