Boiling Point Elevation/Freezing Point Depression T = m K Where: T = T(solution) - T(pure solvent) * m = (# moles solute / Kg solvent) K b = boiling point elevation constant. K f = freezing point...

Boiling Point Elevation/Freezing Point Depression

T = m K

Where:

T	= T(solution) - T(pure solvent) *
m	= (# moles solute / Kg solvent)
K_b	= boiling point elevation constant.
K_f	= freezing point depression constant.

K_b
and K_f
depend only on the SOLVENT. Below are some common values. Use these values for the calculations that follow.

Solvent	Formula	K_b (°C / m)	K_f (°C / m)
Water	H₂O	0.512	-1.86
Ethanol	CH₃CH₂OH	1.22	-1.99
Chloroform	CHCl₃	3.67
Benzene	C₆H₆	2.53	-5.12
Diethyl ether	CH₃CH₂OCH₂CH₃	2.02

*Please note that ΔT as defined above will be a negative number for freezing point depression. Therefore, K_f
must also be given as a negative number.

The boiling point of diethyl ether CH3CH2OCH2CH3 is 34.50°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in diethyl ether is estrogen (estradiol).<br>How many grams of estrogen, C18H2402 (272.4 g/mol), must be dissolved in 250.0 grams of diethyl ether to raise the boiling point by 0.450 °C ? Refer to the table for the necessary boiling or freezing point constant.<br>Solvent<br>Formula<br>Kb (°C/m) Kf (°C/m)<br>Water<br>H20<br>0.512<br>1.86<br>Ethanol<br>CH3CH2OH<br>1.22<br>1.99<br>Chloroform<br>CHC13<br>3.67<br>Benzene<br>CGH6<br>2.53<br>5.12<br>Diethyl ether CH3CH2OCH2CH3<br>2.02<br>g estrogen.<br>

Extracted text: The boiling point of diethyl ether CH3CH2OCH2CH3 is 34.50°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in diethyl ether is estrogen (estradiol). How many grams of estrogen, C18H2402 (272.4 g/mol), must be dissolved in 250.0 grams of diethyl ether to raise the boiling point by 0.450 °C ? Refer to the table for the necessary boiling or freezing point constant. Solvent Formula Kb (°C/m) Kf (°C/m) Water H20 0.512 1.86 Ethanol CH3CH2OH 1.22 1.99 Chloroform CHC13 3.67 Benzene CGH6 2.53 5.12 Diethyl ether CH3CH2OCH2CH3 2.02 g estrogen.

Jun 07, 2022

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Boiling Point Elevation/Freezing Point Depression T = m K Where: T = T(solution) - T(pure solvent) * m = (# moles solute / Kg solvent) K b = boiling point elevation constant. K f = freezing point...

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