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The following properties were measured for an unknown hydrocarbon in a lab with an ambient temperature of 28 degrees Celsius and a barometric pressure of 28.9 inches of mercury (1 inch Hg=25.4 torr):
boiling point: 78.2 degrees Celsius
refractive index: 1.3780
mass of 0.200 mL: 0.133 g
Correct the refractive index and boiling point to 20 degrees Celsius and 1 atmosphere and calculate the density of the unknown.
What is the characteristic of matter that causes it to expand when the temperature increases and contract when the temperature decreases?
An unknown liquid boiling around 185 +/- 5 degrees C in 5% HCl and in a pH 5.5 buffer but is insoluble in water. Shaking the unknown with p-touluenesulfonyl chloride in aqueous NaOH produces a white precipitate that doesn't dissolve in dilute HCl...
A saturated solution was formed when 5.51×10-2 of argon, at a pressure of 1.0 and temperature of 25 , was dissolved in 1.0 of water. Calculate Henerys law constant of Argon
Calculate the ratio of dihydrogen phosphate to hydrogen phosphate in the blood at pH 7.4. The Ka = 6.3 x 10 -8 5. For a weak acid with a pKa of 6.0 calculate the ratio of conjugate base to acid at a pH of 5.0.
The final temperature of the calorimeter is 29.5 deg C. What is the specific heat capacity of the unknown metal. The specific heat capacity of water is 4.184J g^-1 degC^-1. Write answer in decimal form to two decimal places.
A coin dealer, offered a rare silver coin, suspected that it might be a counterfeit nickel copy. The dealer heated the coin, which weighed 18.0 g to 100°C in boiling water and then dropped the hot coin into 26.5 g of water at T = 16.5°C in an insu..
Benzoic acid had a percent recovery of 34% and 2-naphthol had a percent recovery of 85%. Why could this be? (ex. could it be that benzoic acid is a stronger acid and therefore more dissociation occurs, losing mass?)
a 32.85-g sample of a solid is placed in a flask. toluene in which the solid is insoluble is added to the flask so that
the vapor pressure of pure water at 25 degc is 23.8 torr. what is the vapor pressure torr of water above a solution
A wine-dispensing system uses argon canisters to pressurize and preserve wine in the bottle. An argon canister for the system has a volume of 29.1mL and contains 36.6g of argon.Assuming ideal gas behavior
Draw the structure of diacetylferrocene. comment on the distribution of the two acetyl groups over the two aromatic rings: are they likely to be on the same ring or on different rings? Clearly explain your rationale.
the boiling point of another member of this homologous series wasfound to be 309 . what is the likely molecular formula
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