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Please explain A ternary solution of water (w), methanol (m), and acetone (a) is prepared with...

Please explain

A ternary solution of water (w), methanol (m), and acetone (a) is prepared with mole numbers as follows: na = nm = nw/2. What is the mole fraction of acetone in the mixture?

a. 0.50
b. 0.25

c. 2.0

d. 0.30

e. 0.20

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