Which of the following always changes when a substance undergoes a chemical change?
2 answers:
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Answer: The freezing point and boiling point of the solution are and
respectively.
Explanation:
Depression in freezing point:
where,
= freezing point of solution = ?
= freezing point of water =
= freezing point constant of water =
i = vant hoff factor = 1 ( for non electrolytes)
m = molality
= mass of solute (ethylene glycol) = 21.4 g
= mass of solvent (water) =
= molar mass of solute (ethylene glycol) = 62g/mol
Now put all the given values in the above formula, we get:
Therefore,the freezing point of the solution is
Elevation in boiling point :
where,
= boiling point of solution = ?
= boiling point of water =
= boiling point constant of water =
i = vant hoff factor = 1 ( for non electrolytes)
m = molality
= mass of solute (ethylene glycol) = 21.4 g
= mass of solvent (water) =
= molar mass of solute (ethylene glycol) = 62g/mol
Now put all the given values in the above formula, we get:
Thus the boiling point of the solution is