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High school chemistry help

[From: ] [author: ] [Date: 12-04-09] [Hit: ]
What is the vapor pressure of 20 mL of ethanol at the same temperature?3.) What is the mole fraction of KCl in a 0.20 molal solution of KCl?2- if it is in the same volume p= 11.3- 0.......
1.) The number of moles of hydrogen ions equals the number of moles of hydroxide ions.
A:salt hydrolysis
B:end point
C:titration
D:equivalence point
E:buffer capacity

2.) The vapor pressure of 10 mL of ethanol at 20 C is 5.85 kPa. What is the vapor pressure of 20 mL of ethanol at the same temperature?

3.) What is the mole fraction of KCl in a 0.20 molal solution of KCl? (molar mass of KCl = 75 g; molar mass of water = 18 g)

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1- D
2- if it is in the same volume p= 11.7 kPa
3- 0.2 molal mean 0.2 mole in 1 Kg of solvent
1000 g of water = 1000/18=55.5555555 mole of water
mole fraction = ( no of moles )/(total no of moles ) = 0.2 / 55.755555 = 0.00358

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Q-2....Answer is totally wrong.
Doubling the volume does NOT double the vapour pressure. The V.P. is the same.

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