helllp 1) three liquids A,B,C have vapor pressures of 76 mmhg , 132 mmhg and 55

Question

helllp

1) three liquids A,B,C have vapor pressures of 76 mmhg , 132 mmhg and 55 mmHg , respectively at 25 C . what is would be the vapor pressure of a solution made by combinig 0.50 moles of A , 1.25 moles of B , 0.75 moles of C . at 25 C

2) what would be the osmotic pressure of solution 0.500 M in CaCl2 at 30 C ?

3) loot at the solubility curve of KBr in water ( in your textbook) and determine how many grams of this compound will not dissolve if you add 100 g of KBr to 100 g of water at 70 C , and the solution that you prepare is saturated solution

Explanation / Answer

1)mole fraction of A=0.5/(0.5+1.25+.75)=.2

mole fraction of B=1.25/(0.5+1.25+.75)= .5

mole fraction of C= .3

vapor pressure= 0.2*76 + .5*132 + .3*55= 15.2+66+16.5=97.7 mmhg

2)osmotic pressure= iMRT=3*0.5*8.314*303

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