when we want to calculate the chemical design calculation for packed absorber example for system of SO2 absorberd by water , Do we take the density and other properties for the inlet liquid stream (Water) or for the outlet liquid sstream ( SO2+water ) during the calculation. Note that the highest moler flow of the gas streams is for the inlet and highest molar flow of liquid streams is for the outlet . like using onda's method as its request the density of the liquid ,so which density of liquid must to use for inlet stream or for outlet stream and why .? as i explaind before about highst value of molar flow is for the outlet liquid stream