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a sample of powder was found at a crime scene. it is believed that the powder is cocaine. The only four elements in the compound were determined to be C,H,N, and O. Complete combustion of a 0.563 g sample of the unknown powder with excess O2 produced 1.18g of CO2, 0.310g of H2O and 0.176g NO2. The molar mass of the substance was found to be about 300g/mol. what is the molecular formula of the unknown powder? was the substance cocaine?
What molarity of aqueous calcium chloride solution can be expected to show the same conductivity as 0.0050 M aluminum sulfate at 12,500 units. What does the 12,500 units mean in this question?
a cup of hot steaming coffee sits on the desk at 80 degrees celsius and is composed of mostly water with some things
A solution contains 0.635g NaOH in 236 ml solution. What is the [OH-]?
An astrology-loving friend hypothesizes that people born in that week like horror movies more than other genres of movies. You decide to use the scientific method to test this hypothesis.
Consider a galvanic (voltaic) cell that has the generic metals X and Y as electrodes. If X is more reactive than Y (that is, X more readily reacts to form a cation than Y does),
What is the molar solubility of silver chromate. What is the solubility of silver chromate (in grams/L) in 0.045 M potassium chromate
Using the calibration equation and the absorbance you measured for the prepared sample, calculate the ferroin concentration. Show your work and don't forget to include units.
NaCl is added to 33.4ml of 0,327M AgNO3(silver nitrate). What would be the concentration of each of the ions(ie Ag+, NO3- Na+ and Cl-) in the reaction mixture after the reaction.
The total pressure in an 12.4L automobile tire is 42psi at 15 degrees Celsius. how much does the pressue in the tire rise if it warms to a temperature
Why does sulfuric acid protonate the nitrogen atom of the diethylamine group of lidocaine preferentially to that of the amido group
Calculate the percent ionization of 8.0×10?3 M butanoic acid in a solution containing 8.0×10?2 M sodium butanoate
Calculate the density. Copper (II) ion radius of 0.96A and the sulfide ion has a radius of 1.84A. Calculate the % of the cube occupied by the copper(II) sulfide.
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