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Question

A solution contains 27% water, 36.8% ethanol and 36.2% ethanoic acid solution by mass. Calculate the mole fraction of each component in the same order.

A
0.23,0.5,0.26
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B
0.5,0.23,0.26
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C
0.26, 0.23, 0.5
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D
0.5,0.26,0.23
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Solution

The correct option is D 0.5,0.26,0.23
Consider 100 g of solution, it contains 27 g water, 36.8 g ethanol and 42 g of ethanoic acid.
Moles of water = 2718=1.5
Moles of ethanol =36.846=0.8
Moles of ethanoic acid =4260=0.7
Total number of moles 1.5+0.8+0.7=3
Mole fraction of water =1.53=0.5
Mole fraction of ethanol =0.83=0.26
Mole fraction of ethanoic acid =0.73=0.23

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