Question

The mole fraction of naoh in its 40%(w/w) aqueous solution will be

Answer 1

40% w/W means 40 gm of solute in 100 gm of solvent

Thus, solute here is NaOH and solvent is water.

No. Of moles of solvent = 100/18=5.56

No. Of moles of solute = 40/40=1

Xa (mole fraction of solvent)= 5.56/5.56+1 =>

0.847

Xb (mole fraction of solute) = 1-Xa=>0.153

Answer 2

Answer:

ans :0.52

Explanation:

n(H2o): 100/18

n(Naoh): 40/40=1

X(Naoh)= 1/1+100/18

=0.52