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)
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
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.
Doubling the volume does NOT double the vapour pressure. The V.P. is the same.
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