In reverse osmosis, water flows out of a salt solution until the osmotic pressur

Question

In reverse osmosis, water flows out of a salt solution until the osmotic pressure of the solution equals the applied pressure. If a pressure of 62.0 bar is applied to seawater, what will be the final concentration of the seawater at 20 °C when reverse osmosis stops?

I recieved this hint when I answered wrong.

Another way of asking this question is: "At what concentration will the osmotic pressure of the solution be 62.0 bar?" So use the standard osmotic pressure formula and solve for Mc.

=______Mc

Explanation / Answer

1 bar = 0.987 atm
P = 62 bar = 62* 0.987 atm = 61.19 atm
R = 0.0821 atm-L/ mol-K
T = 20 oC = (20 + 273) K = 293 K
C = ?

formula to be used:
P = C*R*T
61.19 = C* 0.0821 * 293
C = 2.54 mol/L
   =2.54 Mc

Answer: 2.54

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