#$10$:

Alcohol containing $15\%$ salt is fed at a rate of $10k\frac{g}{m}in$ in a mixer $($CSTR$)$ that initially holds $100L$ of alcohol containing $5\%$ salt. The exit solution leaves the mixer at a rate of $10k\frac{g}{m}in.$ Determine the exit concentration after $30$ minutes in ppm and assume complete mixing. The density of alcohol is $0\mathrm{.}8\frac{g}{m}L$ and can be assumed constant due to low salt concentration.