PLEASE ANSWER 2.12 THE ANSWER SHOULD BE 390 M. 2.9 is just provided for reference. IT DOES not need to be answered. Instead of using 1 m square plate value you are using 2 m diameter instead to calculate the moles of naphthalene lost.

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2.12b. Evaporation of a drop of water falling in air ter. Repeat Example 2.9 for a drop of water which is originally 2mm in diame- 2.9b. Mass transfer from a flat plate A 1-m square thin plate of solid naphthalene is oriented parallel to a stream of air flowing at 20m/s. The air is at 330K and 101.3kPa. The naphthalene remains at 290K; at this temperature the vapor pressure of naphthalene is 26Pa. Estimate the moles of naphthalene lost from the plate per hour, if the end effects can be ignored