What is the molar mass of caryophyllene? Which alkane compound has the highest vapor pressure?

Caryophyllene, a nonelectrolyte, is one of the compounds responsible for the flavor of cloves. A 207 mg sample of caryophyllene was dissolved in 1.00 g of chloroform (Kb = 3.63oC/m), increasing the boiling point of chloroform by 3.68oC. What is the molar mass of caryophyllene?
Which alkane compound has the highest vapor pressure?
a. C4H10
b. C7H16
c. C5H12
d. C8H18
e. C6H14
3. (5 points) A solution is prepared by adding 0.250 molnapthalene, which is not volatile, to 2.25 mol diethyl ether. What is the vapor pressure of this solution at 25 oC given that the vapor pressure of pure diethyl
ether is 532 torr?
A solution of 5.00 g of lithium chloride in 1.00 kg of water has a freezing point of -0.410 oC. What is the actual van ’t Hoff factor for this salt at this concentration? Kf (water) = 1.86 oC/m
A solution is prepared by mixing 75 g of benzene (C6H6) with 25 g of toluene (C7H8). Both toluene and benzene are volatile. Use the following data to determine the vapor pressure of this solution at 20 oC.
Substance Vapor Pressure at 20 oC (torr)
Benzene 75
Toluene 22
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For each of the following pairs of compounds, identify the one that is more likely to be soluble in water. Explain the rationale for your choice.
(A) Br2 or NaBr
(B) CH3CH2OH or CH3OCH3
(C) CO2 or KOH
Identify the dominant intermolecular forces present in each of the following molecules.
CH3CH2-O-CH2CH3, H2O, and N2
If water contains about 42 mg of oxygen per liter at 20 oC and 1.0 atm, what would be the value of Henry’s law constant for oxygen dissolving in water? The mole fraction of oxygen in air is 0.21.
When aluminum metal reacts with iron (III) oxide to form aluminum oxide and iron metal, 30 kJ of heat are given off for each mole of aluminum metal consumed, under constant pressure and standard conditions. What is the correct value for the standard enthalpy of reaction in the thermo¬chemi¬cal equation below?
2 Al(s) + Fe2O3(s) → 2 Fe(s) + Al2O3(s)
Of all the noble gases, ________ has the weakest intermolecular force and hence the lowest boiling point.
a. He
b. Kr
c. Ne
d. Xe
e. Ar
For each of the following, state the steric number, electron domain geometry, molecular geometry, hybridization and whether it is polar or non-polar.
Molecule Electron domain geometry Molecular geometry hybridization Polar?
NH3
BCl3
CHCl3
CO2
H2O
12. (10 points) Gasoline is primarily a mixture of hydrocarbons and is sold with an octane rating that is based on a comparison with the properties of isooctane (C8H18), which has an enthalpy of vaporization of 35.8 kJ/mol and a boiling point of 98.2 oC. Determine the vapor pressure of isooctane on a very hot summer day when the temperature is 38 oC in torr.
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