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1. An aqueous solution containing 35.0% by mass of an unknown covalent compund in water was found to have a freezing point of -3.5 deg C. Calculate the molar mass of the unknown compund.
2. A 11.6 M aqueaous solution of ethylene glycol (C2H6O2) has the capability of lowering the freezing point of water to -45 deg C! The density of the solution is 1.09 g/mL and the molar mass of ethylene glycol is 62.07 g/mol.a) what is the molality of ethylene glycol solution?b) what is the mole fraction of the ethylene glycol solution?
3. A mixture of benzene and methylbenzene has a normal boiling point of 398K. Given the information below:
Substance Vapor Pressure at 398K Molar MassBenzene 1520 torr 78.11 g/moleMethylbenzene 570 torr 92.14 g/mole
a) what is the mole fraction of benzene in the liquid (solution)?b) what is the mole fraction of benzene in the vapor?
a 5.00 gram sample of potassium chlorate/potassium chloride mixture was heated in a test tube. A total of 1.00 L of oxygen gas was collected over water at 25 degrees c and 741 torr. determine the percentage of potassium chlorate in the mixture.
The decomposition of 3.32 g CaCO3 yields 1.24 g CaO. What is the percent yield of this reaction? CaCO3(s) -> CaO(s) + CO2(g)
draw the organic and inorganic products and select the correct (R) or (S) designation around the stereocenter carbon in the organic substrate and organic product. Include wedge/dash bonds and H on a stereocenter.
Explain why saturated sodium hydrogen carbonate is used to wash the organic layer in the Friedel Crafts Acylation.
The compound malonate is an analog of succinate and is a strong inhibitor of succinate dehydrogenase. The active site of the enzyme will bind to either molecule, however malonate will not undergo any reaction and gets stuck on the enzyme.
You have 250.0 mL of 4.00 M sugar solution. You add 319.7 mL of water to this solution. Determine the concentration of the sugar solution after the water has been added.
If you prepared a solution by adding equal numbers of moles sodium sulfite (Na2SO3) and sodium hydrogen sulfite (NaHSO3) to 50 mL water, what would be the pH of the solution?
A proton in a linear accelerator has a de Broglie wavelength of 144 rm pm. what is the speed of the proton?
In photosynthesis, plants use energy from the sun in combination with carbon dioxide and water to form glucose (C6H12O6) and oxygen. If 4.50 moles of water react with carbon dioxide, what mass of glucose is produced?
The half-life of nuclium is 12.3 years. If 49.0 mg of nuclium is released from a nuclear power plant during the course of a mishap, what mass of the nuclide will remain after 98.4 years.
write a balanced chemical equation for the reaction that occures in the experiment (B) Give the net ionic equation for this reaction
The most probable mechanism of reactivity for the solvolysis of tertiary butyl chloride is a)Sn1 b)Sn2 c)E1 d)E2. I performed the experiment and benzyl chloride (primary) and teriaty butyl chloride (tertiary) ran the same amount of time. 2-chloro-..
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