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Duplicate 0.50 g samples of a finely powdered gold ore are digested in an HCl/HNO3 mix and evaporated to dryness. Each sample is then treated with an additional 15 mL of HCl and diluted with an additional 40 mL of water. To one sample a 1.00 ml volume of a gold standard containing 5.0 ug/mL of gold is then added. Both samples are then treated with 5 mL of concentrated HBr to produce a gold bromide complex, and this is then extracted into 5 mL of methylisobutyl ketone. The atomic absorption signals were A=0.22 for the unspiked sample and 0.37 for the sample spiked with the additional gold standard. Assuming that the signal is linear over the measured absorptions, what is the concentration of gold in the original sample in ug/g?
The solvent used in the preparation of diphenylacetylene (2) is triethylene glycol. A) Write the structure of triethylene glycol; circle and label each of the functional groups in this molecule. B) What structural features account for the high boi..
What is the pressure (in mmHg) of the gas inside the apparatus below if the atmospheric pressure is Patm=775 mmHg, h1=20 mmHg, and h2=50 mmHg
Use the periodic table to determine the element corresponding to each of the following electron configurations.
Compute the pH of a solution made by mixing eighty grams of NaCH3COO, to 39 grams of CH3COOH, and adding in H2O to produce 500. mL of solution.
Predict the major organic product formed in the addition of HBr to 2,3-dimethyl-2-butene. Provide a stepwise mechanism for the reaction, showing all electron movement using the curved arrow convention.
Combustion of 5.50 of this compound produced 8.07 of carbon dioxide and 3.30 of water. How many moles of carbon C, were in the original sample. How many moles of hydrogen H, were in the original sample
a solution initially 0.100 m in hocl and 0.300 m in naocl. what is the ph in 0.030 mol of solid naoh is added to 1.00 l
Would there be any moisture diffusion in this system? In which direction? Using your sorption isotherm estimate the final moisture contents and water activities of each component?
What is the percent purity of the calcium hydroxide if the titration requires 7.81 mL of the acid to reach the endpoint?
assume that you have two unlabled bottles, one with cyclohexane and one with cyclohexene. How could you tell them apart by carrying out chemical reactions
What is the vapor pressure of a solution consisting of 4 moles of benzene and 5 moles of toluene. What is the mole fraction of benzen in the vapor above the solution from the mixture
35.5 grams of an unknown substance is heated to 103.0 degrees celsius and then placed into a calorimeter containing
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