f a beaker of distilled water and a beaker of seawater are placed together in th
ID: 474121 • Letter: F
Question
f a beaker of distilled water and a beaker of seawater are placed together in the same enclosed chamber, then assuming equal initial volumes and constant temperature, the volumes will
remain equal in the two beakers.
increase in the seawater beaker and decrease in the distilled-water beaker.
increase in the distilled-water beaker and decrease in the seawater beaker.
3 points
QUESTION 22
If ethanol (boiling point, 78ºC) and methanol (boiling point, 65ºC) are placed in side-by-side beakers in an enclosed chamber, at room temperature, what will be the partial pressures of the air inside the chamber when equilibrium is reached?
more ethanol vapor pressure than methanol
equal vapor pressures of ethanol and methanol
less ethanol vapor pressure than methanol
3 points
QUESTION 23
If ethanol (boiling point 78ºC) and methanol (boiling point 65ºC) are mixed together in equimolar amounts and placed in an enclosed chamber at room temperature, what will be the partial pressures of the air inside the chamber when equilibrium is reached?
more ethanol vapor pressure than methanol
equal vapor pressures of ethanol and methanol
less ethanol vapor pressure than methanol
3 points
QUESTION 24
A mixture of 2% ethanol in water can be distilled to produce vapor that is 10% (or more) ethanol in water, and this vapor can then be condensed to give a higher alcoholic content than the original liquid mixture. What law explains this?
the law of conservation of matter
Hess’s law
Raoult’s law
the ideal gas law
a.remain equal in the two beakers.
b.increase in the seawater beaker and decrease in the distilled-water beaker.
c.increase in the distilled-water beaker and decrease in the seawater beaker.
Explanation / Answer
Answer (F) : Beaker of Distilled water and Sea water.
This question is based on colligative property i.e. Lowering Of Vapor Pressure.
Vapour pressure of solution is lower than that of pure solvent and as Boilin point of liquid is inversely proportional to the vapour pressure it follows that B.P. of solution is higher than that of pure solvent
Distilled water is an example of pure solvent and sea water being containing various salts is an example of solution. Hence as per above discussion B.P. of sea water is highe than that of distilled water at constant T and P.
Therefore, at constant T and P, distilled water evaporates faster that sea water and this lowers the volume of distilled water. And at the same time as rate of evaporation of sea water is lower the evaporated distilled water which got condensed in sea water beaker will not evaporate back much, which increases volume of sea water.
Answer option (b) Volume will increase in the seawater beaker and decrease in the distilled-water beaker.
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