A mixture of water (density 1000 kg/m3) and oil (density 800 kg/m3) is flowing t

Question

A mixture of water (density 1000 kg/m3) and oil (density 800 kg/m3) is flowing through a tube of diameter 2 cm with a velocity of 4 m/s. The mass flow rate is measured to be 1.068 kg/s. Determine (a) the density of the liquid mixture, (b) the percentage of oil in the mixture by mass. Assume liquids to be incompressible. I solved part a and correctly got 849 kg/m for the density. I tried to calculate density through percentages and got 75%, this is wrong however because its associated to the densities... How can I find the percent by mass with the information provided?

Explanation / Answer

area * velocity = 1.068/mix density

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