How many grams of methyl alcohol should be added
Asked by admin @ in Chemistry viewed by 275 People
How many gram of methyl alcohol should be added to 10 litre tank of water to prevent its freezing at 268k kf for water is 1.86?
Asked by admin @ in Chemistry viewed by 275 People
How many gram of methyl alcohol should be added to 10 litre tank of water to prevent its freezing at 268k kf for water is 1.86?
Answered by admin @
Answer : The mass of methyl alcohol will be, 860.215 grams
Solution :
First we have to calculate the mass of solvent (water).
Formula used for lowering in freezing point :
where,
= change in freezing point for freezing point depression
= freezing point of pure solvent = 273 K
= freezing point of solution = 268 K
= freezing point constant = 1.86 K/m
= mass of solute (methyl alcohol) = ?
= mass of solvent (water) = 10 kg
M = molar mass of solute (methyl alcohol) = 32 g/mole
m = molality
Now put all the given values in this formula, we get the mass of methyl alcohol.
Therefore, the mass of methyl alcohol will be, 860.215 grams
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