Solutions Question 137

Question: If 5.85 gms of $ NaCl $ are dissolved in 90 gms of water, the mole fraction of $ NaCl $ is [CMC Vellore 1991; MP PMT 1994; AFMC 1998]

Options:

A) 0.1

B) 0.2

C) 0.3

D) 0.01

E) 0.0196

Show Answer

Answer:

Correct Answer: E

Solution:

5.85 g NaCl = $ \frac{5.85}{58.5},mole=0.1mol $ 90 g $ H_2O=\frac{90}{18},moles=5moles $ mole fraction of NaCl = $ \frac{0.1}{5+0.1}\approx 0.0196 $ .



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