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Assume that you are an experienced organic chemist with perfect recrystallization technique. You recrystallize 10g of impure naphthalene from Ethanol in Corvallis, OR (elevation; sea level) and recover 7.4g of pure naphthalene.
If you were to repeat the experiment with 10g of sample in Mexico City (elevation: 7700 ft) what change, if any, would there be in the amount of boiling ethanol needed to dissolve the impure naphthalene? Explain your answer clearly.
Calculate the energy in kJ/mol of a mol of photons in the gamma ray region of the electromagnetic spectrum that has a wavelength of 4.13 pm. Express answer in scientific notation.
A patient weighs 165 pounds and is to receive a drug at a dosage of 45.0 mg per kg of body weight. The drug is supplied as a solution that contains 25 mg of drug per mL of solution. How many mL of the drug should the patient receive?
If the barometric pressure is 741 mmHg, and if h = 53. 0 mm, what is the pressure of the gas, expressed in atm and in kilopascals, if the substance in the tube is mercury having a density of 13.6 g/mL.
Calculate approximately the heat released when you are given a chemical equation as 2-methyl-1-propene CH 3 ) 2 C CH 2 reacts
Hydrogen gas is collected at 29 c the total pressure of the system is 773 torr. If the vapor pressure of water at 29c is 30 torr what is the partial pressure of the hydrogen gas?
If you fill the larger tank with oxygen to a pressure of 135 , to what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time? Assume ideal behavior for all gases.
Which statement is true for the cell as it discharges?
The Kal of this aid is 1.0 x 10^-10 and Ka2 is 1.0 x 10^-10. Calculate the concentration of A2- in this solution.
Which term or terms could be used to describe this sample of gold? Check all that apply. mixture heterogeneous mixture homogenous mixture solution pure chemical substance compound element
Determine the number of moles of O2 produced by the decomposition of 213 g of NaClO3.
A bottle containing 335 of cleaning solution is used for carpets. If the cleaning solution has a specific gravity of 0.850, what volume of solution was used?
For the reaction: 2N2O5(g) -> 4NO2(g) + O2(g) at the time when N2O5 is being consumed at a rate of -6.0 × 10-4 M/s, what is the rate at which O2 is being formed?
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