Fresh air flows at a pressure of 1atm, a velocity 1.001ms, and at a temperature of 300K above a naphthalene plate with a surface temperature of 300K. Calculate the diffusion rate of naphthalene to the air in mols; report as ( (fill in the missing number to an accuracy of at least three decimal places). The vapour pressure of naphthalene can be taken to be 19.11Pa at 300K. )*10-6mols-1

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