What weight of solute is required to disolve in 180 g of water?
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Let the weight of solute (w2) = w grams
Weight of solvent (w1)= 180 grams
Molar mass of solvent H2O(M1) = 18
Moalr mass of solute (M2) = M
Let the vapour pressure of pure solvent (p1°) = x
Vapour pressure of solution (p1) = (x*4)/5
(p1°- p1)/ p1°= (w2*M1)/(w1*M2)
(x- 4x/5)x = (w *18)/(180*M2)
(1-4/5) = w/(10*M)
w=1/5*10*M
w= 2M
Therefore weight of the solute = 2M
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