$A$ solution contains $1 \ mole$ of water and $4 \ mole$ of ethanol. The mole fraction of water and ethanol will be
- A$0.2$ water + $0.8$ ethanol
- B$0.4$ water + $0.6$ ethanol
- C$0.6$ water + $0.8$ ethanol
- D$0.8$ water + $0.2$ ethanol
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