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You recrystallize 10 g of impure naphthalene from ethanol at sea level and recover 7.4 g pure naphthalene. If you were to repeat the experiment at the elevation of 7700 ft, what change, if any, would there be in the amount of boiling ethanol needed to dissolve the impure naphthalene? Explain
elemental sulphur occurs in the solid state as 8-membered rings arranged in rhombohedral crystal structure s8 which
Consider a sealed flask with a moveable piston that contains 5.25L of O2 saturated water vapor at 25O C. The vapor pressre of water at this temperature is 23.76 mmHg. The piston is depressed at constatnt temperature so that the gas is compressed t..
Your friend decides to decrease cooking time for spaghetti noodles by adding table salt to 2.0 L water. How much table salt (NaCl) must be added to the water in order to raise the boiling point by 4.0?C? (Kf = 1.86?C/m, Kb = 0.512?C/m)
You inherit a gold bar that measures 7.0 inches by 3.0 inches by 2.0 inches. How many ounces does the bar weigh?
Important information about Chem problem, A 25 mL sample of .13M HCl is mixed with 15mL of .24M NaOH. The pH of the resulting solution will be nearest. The answer is 11.9
What mass of sucrose should be combined with 479 of water to make a solution with an osmotic pressure of 8.00 at 315 ? (Assume the density of the solution to be equal to the density of the solvent.)
Describe two types of regulation of the enzyme glutamine synthetase and explain why the regulation
Assuming that the volume of a solid or liquid was independent of the external pressure, we deduced that there was no change in the Gibbs free energy of a solid or liquid when the pressure is changed.
A liquid mixture of methyl acetate and ethyl acetate at 50oC and 1 atm is in equilibrium with gas containing methyl acetate, ethyl acetate and 23 mole % nitrogen. What are the molar fractions of ethyl and methyl acetate in the liquid and gas phase
when measured in aa quartz cuvett of 1cm path length. What is the concentration of DNA in µg/mL?
Calculate the number of grams of propane (C3H8) required to heat all of the water in a 50-gallon hot-water tank from 23.4 degrees C to 65.0 degrees C
What is the heat of vaporization(kJ/mol) if it takes 3,452 J of heat to completely vaporize 2.68 moles of the liquid at its boiling point
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