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A confiscated white substance suspected of being cocaine was purified by a forensic chemist and subjected to elemental analysis. Combustion of a 50.68 mg sample yielded 150.0 mg of CO2 and 46.05 mg of H2O. Analysis for nitrogen showed that the compound contained 9.39% N by mass. The formula for cocaine is C17H21NO4. Can the forensic scientist conclude that the suspected compound is cocaine?
how to find the molar concentration of a soloution of phosphoric acid if 17.8 mL of it neutralizes 20.0 mL of 0.050 mol/L calcium hydroxide.
A rigid flask is initially filled with 4.00 atm of NO2(g) and no N2O4(g) at 100 C. After equilibrium is achieved, the pressure of NO2 is 1.56 atm.
A student studied the clock reaction described in this experiment. She set up Reaction Mixture 2 by mixing 20 mL of 0.010 M KI, 10 mL 0.001 M Na2S2O3, 10 mL 0.040 M KBrO3, and 10 mL 0.10 M HCl using the procedure given. It took about 45 seconds fo..
If 3.55 g of CuSO4 are dissolved in 925 mL of 0.30 M NH3, what are the concentrations of Cu2+, Cu(NH3)42+, and NH3 at equilibrium Kf, Cu(NH3)42+= 1.1 x 1013 . Assume that most of the Cu2+ is converted to the complex since K is a very large number...
A cube of metal which looks like gold (Au, 19.32 g/cm3) is suspected by a modern Archimedes of being either iron (Fe, 7.90 g/cm3) coated with gold or aluminum
The equilibrium constant, Kp, for the reaction PCl5(g) ===== PCl3(g) + Cl2(g) is 1.05 at 250 C. The reaction is started with PCl5,PCl3 and Cl2 at 0.177,0.223 and 0.111 atm at 250 C. When the reaction comes to equilibrium, the pressure of PCl5 must..
the specifictaions associated with a commercial spectrophotometer are diffraction grating with 600 groves per mm. focal
a method for the determination of copper yields results that are too low by 0.47mg. What will be the percent relative error due to this source if the weight copper in a sample is 45.3 mg
The flow of the second is 245 gpm (56 m3/h) with a temperature of 120oF (49oC). Calculate the flow and the temperature of the combined water.
As per to the EPA, the maximum contaminant level (MCL) of antimony in drinking water is 0.0060 mg/L. (a) Transfer the MCL of antimony from milligrams per liter to parts per billion (ppb).
What are the normal freezing points and boiling points of the following solutions? (a) 11.1 g NaCl in 172 mL of water (b) 11.7 g of urea in 66.4 mL of water
magnesium hydroxide is 54.87% oxygen by mass. How many grams of oxygen are in 175g of the compound ?
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