Question

The freezing point of water H2O is 0.00°C at 1 atmosphere. A
nonvolatile, nonelectrolyte that dissolves in water is antifreeze
(ethylene glycol).

How many grams of antifreeze, CH2OHCH2OH (62.10 g/mol), must be
dissolved in 297.0 grams of water to reduce the freezing point by
0.400°C ?

_____ g antifreeze.

Answer #1

delta T = Kf * molality

where, delta T = depression in freezing point

0.400 = 1.86*molality

molality = 0.400 / 1.86 = 0.215 m

molality = number of moles of solute / mass of solution in kg

0.215 m = number of moles of solute / 0.297 kg

number of moles of solute = 0.215 * 0.297 = 0.0639 mole

number of moles of solute = mass of solute /molar mass of solute

0.0639 = mass of solute / 62.10 g.mol^-1

mass of solute = 0.0639 * 62.10 = 3.97 g

Therefore, the mass of antifreeze added must be 3.97 g

The freezing point of water
H2O is 0.00°C at 1
atmosphere.
How many grams of barium sulfide
(169.4 g/mol), must be dissolved in
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the freezing point by 0.400°C ?
g barium sulfide.

The freezing point of ethanol CH3CH2OH is -117.30°C at 1
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How many grams of saccharin, C7H5NO3S (183.2 g/mol), must be
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A nonvolatile, nonelectrolyte that dissolves in benzene is
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If 10.34 grams of cholesterol, C27H46O (386.6 g/mol), are
dissolved in 157.9 grams of benzene ...
The molality of the solution is_______ m. The freezing point of
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2.The boiling point of ethanol
CH3CH2OH is
78.50°C at 1 atmosphere.
A nonvolatile, nonelectrolyte that dissolves in
ethanol is estrogen
(estradiol).
How many grams of estrogen,
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______g potassium
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Each question is and was separated by an asterisk.
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bromide, (218.7 g/mol), are dissolved in
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The freezing point of the solution is °C.
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(85.00 g/mol), must be dissolved in
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1.The freezing point of water is 0.00°C at 1 atmosphere. If
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The molality of the solution is_____ m. The freezing point of
the solution is______ °C.
2.
The boiling point of
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100.00 °C at 1 atmosphere.
If 13.32 grams of potassium
iodide, (166.0 g/mol), are dissolved in
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The molality of the solution is______ m.
The boiling point of the...

the freezing point of water is 0.00°C at 1 atmosphere. If 14.56
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CH3CH2OCH2CH3
is 34.50°C at 1 atmosphere. A nonvolatile,
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If 13.19 grams of chlorophyll,
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If 13.81 grams of nickel(II)
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