1) What mass of ethanol be added to 1.0 kg
water to have the mole fraction of ethanol
equal to 0.20 ?
A) 63.89 g
B) 6.39 g
C) 638.89 g
D) 683.89 g
Answers
Answered by
2
Answer:
№ of moles of water present in 1000- g of water = 1000/18= 55.55.
When the mole fraction of water is 0.80 and the mole fraction of ETHANOL is 0.20, number of moles of ETHANOL to be added to the mixture= 55.55/4
= 13.8875- moles .
So weight of ethanol to be added to 1- Kg of water= 13.8875 x 46 = 638.9- g.
So if we mix 1- Kg of water to 638.9- g of ETHANOL the mole- fraction of ETHANOL will be 0.20.
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