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A 1.00 L container of water was passed through a solid phase extractor. As the water passed throughout the extractors, the analyte was adsorbed onto the solid phase. It was then eluted with 10.0mL of hexane. Gas Chromatography determined that there was 14.2 mg/L of analyte in the hexane. Explain what is the concentration of analyte in the water?
a chemical reaction is found to have an activation energy ea 15 kjmol. at a temperature of 505 k what fraction of
as we know that innbsp haber-bosch process hydrogen gas reacts with nitrogen gas and form ammonia according to this
Draw and exlpain using representation of molecular orbitals the structure and bonding found in ethane; indicate clearly the structure
In an experiment 1.65g of lead(ii) nitrate react with .327g of zinc. What is the mole relationship between the lead nitrate and the zinc.
Calculate the change in enthalpy of HCl + NaOH--> NaCl + H2O for this reaction using Hess's Law. Units should be kJ/mol.
a colorless liquid that is commonly known as grain alcohol, is 0.789 g/mL. Calculate the mass of 17.4 mL of the liquid.
A geological sample is found to have a Pb-206/U-238 mass ratio of 0.337/1.00. Assuming there was no Pb-206 present when the sample was formed, how old is it. The half-life of U-238
The following lab requires water free conditions as well as reflux for reaction to be successful. Draw a schematic and label your reaction set up
discharged into a small stream saturated with oxygen from the air at 25 celcius. How many liters of this water could be contaminated to the extent of removing all the dissolved oxygen by biodegradation?
Calculate the cell potential for the following reaction as written at 59 degree celsius, given that [zn2+]=0.765 and [fe2+]=0.0120 M.
consider the reaction 4nh37o2--gt 4no26h2o. at a certain instant the initial rate of the disappearance of oxygen gas is
How long would it take to electroplate a metal surface with 0.500 g nickel metal from a solution of Ni 2+ with a current of 4.0 A?
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