Sea water is `3.5%`by mass of a salt and has a density `1.04gcm^(-3)` at `293K`.Assuming the salt to be sodium chloride ,calculate the osmotic pressure of sea water.Assume complete ionisation of the salt-

Explanation

Mass of NaCl = 3.5g
No. of moles `=(3.5)/(58.5)`
Actual number of moles of particles of solute in solution
`= (2 xx 3.5)/(58.5)`
Volume of solution `= (100)/(1.04 xx1000)` litre
`pi=(2xx3.5)/(58.5)xx(1.04xx1000)/(100)xx0.0821xx293=29.93` atm