1.

If the mole fraction of sodium is 0.25 in 9 moles of liquid carbon dioxide, what is the mass fraction of sodium?(a) 0.10(b) 0.15(c) 0.20(d) 0.25

Answer» Correct option is (b) 0.15

The explanation: 0.25 = n/(n + 9), => n = 3, => mass of sodium = 3*23/(3*23 + 9*44) = 0.15.


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