Mole ConceptHard
Question
The mole fraction of NaCl in aqueous solution is 0.2. The solution is
Options
A.13.9 m
B.Mole fraction of H2O is 0.8
C.acidic in nature
D.neutral
Solution
(A), (B) and (D) Explanation :
(A) xB =
⇒ m + 
= 5m ⇒ 4m = 
⇒ m = 
= 13.88
(B) xB = mole fraction of NaCl = 0.2, xNaCl + xH2O = 1, xH2O = 1 - 0.2 = 0.8
(D) is correct because NaCl is salt of NaOH (strong base) and strong acid (HCl).
(C) is not possible.
(A) xB =
⇒ m + = 5m ⇒ 4m = ⇒ m = = 13.88(B) xB = mole fraction of NaCl = 0.2, xNaCl + xH2O = 1, xH2O = 1 - 0.2 = 0.8
(D) is correct because NaCl is salt of NaOH (strong base) and strong acid (HCl).
(C) is not possible.
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