Question

The vapor pressure of ethanol is 54.68 mm Hg at 25°C. How many grams of estrogen (estradiol), C18H24O2, a nonvolatile, nonelectrolyte (MW = 272.4 g/mol), must be added to 203.1 grams of ethanol to reduce the vapor pressure to 53.09 mm Hg ? ethanol = CH3CH2OH = 46.07 g/mol.

Answer #1

According to Raoult’s law:

P = Po*X(solvent)

53.09 = 54.68*X(solvent)

X(solvent) = 0.9709

This is mole fraction of C2H5OH

mass of C2H5OH = 203.1 g

we have below equation to be used:

number of mol of C2H5OH,

n = mass of C2H5OH/molar mass of C2H5OH

=(203.1 g)/(46.07 g/mol)

= 4.409 mol

X(C2H5OH) = n(C2H5OH)/( n(C2H5OH) + n(solute))

0.9709 = 4.409 / ( 4.409+n(solute))

4.28+0.9709*n(solute) = 4.409

0.9709*n(solute) = 0.1282

n(solute) = 0.132 mol

Molar mass of estrogen = 272.4 g/mol

we have below equation to be used:

mass of estrogen,

m = number of mol * molar mass

= 0.132 mol * 272.4 g/mol

= 35.96 g

Answer: 35.96 g

The vapor pressure of benzene is 73.03 mm Hg at 25°C. How many
grams of estrogen (estradiol), C18H24O2, a nonvolatile,
nonelectrolyte (MW = 272.4 g/mol), must be added to 240.8 grams of
benzene to reduce the vapor pressure to 71.04 mm Hg ?
benzene = C6H6 = 78.12 g/mol.
________g estrogen

The vapor pressure of diethyl ether (ether) is 463.57 mm Hg at
25°C. How many grams of testosterone, C19H28O2, a nonvolatile,
nonelectrolyte (MW = 288.4 g/mol), must be added to 198.3 grams of
diethyl ether to reduce the vapor pressure to 457.31 mm Hg ?
diethyl ether = CH3CH2OCH2CH3 = 74.12 g/mol. g testosterone

Raoult’s Law Calculations
The vapor pressure of diethyl ether (ether) is
463.57 mm Hg at 25°C.
How many grams of aspirin,
C9H8O4, a
nonvolatile, nonelectrolyte (MW = 180.1 g/mol),
must be added to 224.2 grams of diethyl
ether to reduce the vapor pressure to
458.89 mm Hg ?
diethyl ether =
CH3CH2OCH2CH3
= 74.12 g/mol.
g aspirin

1. The freezing point of benzene C6H6 is 5.50°C at 1 atmosphere.
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If 10.34 grams of cholesterol, C27H46O (386.6 g/mol), are
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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,
C18H24O2...

Hello! T'm in Gen Chem II now, but unfortunately I had to take a
semester off, so I'm a bit rusty. I'd be really grateful if somene
could help me solve this and post a thorough explanation. Thank
you!
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