Error in neglecting the convection term in evaporation. A) Re-work the problem in the text by neglecting the term xA(NA + NB) in Eq. Show that this leads to
NAZ = AB/z1 - z2(xA1 - xA2)
This is a useful approximation if A is present only in very low concentrations.
B) Obtain the result in (a) from Eq. by making the appropriate approximation.
C) What error is made in the determination of AB in Example if the result in (a) is used?

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.