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46 gms of ethyl alcohol is dissolved in ...

46 gms of ethyl alcohol is dissolved in 18 gms of water. Calculate the mole fraction of ethyl alcohol. (At. wt of C = 12, 0 = 16, H= 1).

Text Solution

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Molecular mass of ethyl alcohol, `C_(2)H_(5)OH`
`=2xx12+1xx5+16+1=46`
Weight of ethyl alcohol = 46 g
No. of moles of ethyl alcohol `=(46)/(46)=1`
Molecular mass of water = 18, Weight of water = 18 g
No. of moles of water `=(18)/(18)=1`
Total number of moles of ethyl alcohol and water `= 1 + 1 = 2.`
Mole fraction of ethyl alcohol in solution `=(1)/(2)=0.5`
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