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What mass of ethanol be added to 1.0kg w...

What mass of ethanol be added to 1.0kg water to have the mole fraction of ethanol equal to 0.202 a)63.89g b)6.39g c)638.89g d)683.89g

A

63.89g

B

`6.39g`

C

`638.89g`

D

`683.89g`

Text Solution

Verified by Experts

The correct Answer is:
C
`0.2= ((m//46g mol^(-1)))/((m//46g mol^(-1)) + (1000g//18g mol^(-1))), (m)/(46g)= (0.2 xx 1000)/(18) xx (1)/(0.8) =13.89` i.e, `m=13.89 xx 46g= 638.89g`
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