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A 20 mg sample of a compound is dissolved in 5.0 ml of water and extracted with 2.5 mL of heptane. After separation of the layers, the heptane layer is found to contain 15 mg of the compound. What is the partition coefficient of the compound, Khept/water?
Determine the partial pressure and total pressure of each gas in the vessel and process of reaction runs until eighty five of the Oxygen is used and the vessel get cooled to its starting or initial temperature.
Calculate the pH at the points in the titration of 20.00 mL of 0.318 M NH3 of 0.470 M HCl have been added. For NH3, K_b=1.8*10^-5.
A certain substance has a heat of vaporization of 44.76 KJ/mol. At what kelvin temperature will the vapor pressure be 4.00 times higher than
How much energy (in calories) is needed to heat 17cm^3 of fat from room temperature (25 C) to its melting point (35 C)?
calculate the mass of a sample of gold that occupies 5.0 x 10 (exponent -3) cm cubed. the denisty of gold is 19.3 g/cm cubed.
Name the chemical family of elements that is absent from Mendeleev's table. 2) Which 4 elements were missing from mendeleev's periodic table? atomic masses: 45, 68, 70, 180
A 128.2-mL sample of a 0.15 M solution of H3PO4 is titrated with 0.18 M NaOH. What volume of base must be added to reach the third equivalence point
Calculate the theoretical amount of oxygen based on your starting mass of reactant. Then calculate the percent yield when you compare your actual yield to this theoretical yield.
Describe how you would make 500 mL of 0.150 M Na2SO4 given 1 kg of Na2SO4, a distilled water supply, a balance, anf a 500-mL volumetric flask.
If the reaction is carried out in a 2.0 L container and 0.010 mol of PH3 is consumed each second, what are the rates of production of P4 and H2?
the forensic technician at a crime scene has just prepared a luminol stock solution by adding 11.0 of luminol to creating a solution with a total volume of 75.0 . What is the molarity of the stock solution of luminol?
Acid rain over the Great Lakes has a pH of about 4.5. Acid rain over of the West Coast has a pH of 5.3. How many times more concentrated is the acid in rain over the Great Lakes?
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