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Table: Mass of 100ml beaker: 61.911g Mass of beaker + 60mL Di H2O: 117.653g Mass of...

Table:

Mass of 100ml beaker: 61.911g

Mass of beaker + 60mL Di H2O: 117.653g

Mass of Beaker + H2O + 12g NaCl: 130.639g

Mass of empty 50.0mL Volumetric flask: 33.810g

Mass of volumetric flask + 50.0mL NaCl(aq) solution: 90.848g

Boiling Point temperature of NaCl(aq) solution: 106.0*C

Boiling point temperature of Di H2O: 100.0*C

Question: Calculate the mole fraction of NaCl in solution and Given that the boiling point elevation for water is K(b) = 0.512*C/m, calculate how much the bp temperature of the water should have increased by Delta T. (C is Celsius.)

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Answer #1

For NaCl, vant hoff factor, i = 2 because NaCl dissociates into two ions (Na+ and Cl-), it may be possible that answer will not require multiplkication of i, in that case elevation of temperature will be 3.77 / 2 = 1.885 and elevation of boiling point will be 101.885 C

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