Q4. Air at 35C and 1 atm flows at a mean velocity of 30 m a flat plate 0.5 m long. Calculate the mass transfer coefficie water vapour from the plate into air. Assume the concentra vapour in air as very small. The diffusion coefficient of wate vapour into air is 0.256 10-4 m2 s-1. The Colburn j-factor heat transfer coefficient is given by jH = 0.0296 Re-0.2