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All hydrogen sulfide (H2S) contained in 4.00 g of crude oil is removed by distillation and collected in a CdCl2 solution. The precipitate of CdS is then filtered, washed and converted into CdSO4 by calcination. If 0.1236g of CdSO4 is recovered, what is the percentage mass of H2S in the original sample of crude oil? Write and balance all reactions.
Based on the Henderson-Hassalbach equation how many mmols of Tris-HCl are there in a 100 mL of a 100 mM Tris-HCl buffer solution at pH 8.1? Note that the 100 mM refers to the sum of Tris and Tris-HCl concentrations. Answer in mmols
what is the osmolarity of a solution containing 0.1 m nano3 and 0.2 m nacl? what is the molarity of the solution
A patient weighs 165 pounds and is to receive a drug at a dosage of 45.0 mg per kg of body weight. The drug is supplied as a solution that contains 25 mg of drug per mL of solution. How many mL of the drug should the patient receive?
The C^14 decay rate for the sample of glue was found to be 5.60d/min/g. What is the approximate age of the glue. Disintegration of C^14 is a first order process with a rate constant 1.209*10^-4 year^-1.
the addition of bromine to an equimolar mixture of cis- and trans-2-butene generates only three stereoisomers. Explain.
Calculate the degree of unsaturation in the following formulas and draw a possible structure for each C8H8O C4H7Cl
why is lithium chlorate be a more practical choice for the "chlorate candle" than either sodium or potassium chlorate
Calculate the pH of a solution containing 25.00 mL of 0.12 M formic acid (Ka = 1.7 x 10^-4) to which the following amounts of 0.10 M NaOH have been added:
A dry cleaning solvent with a molar mass of 146.99 grams/mole that contains C, H, and Cl is suspected to be a cancer causing agent. When a 0.250 gram sample was studied by combustion analysis, 0.451 grams of CO2 and 0.0617 grams of H2O was formed...
A solution of a specific vitamin has ?max = 223 nm and a concentration of 8.31 × 10-7 M. The absorbance of the solution at 223 nm is A = 0.180. What is the molar absorptivity of the vitamin at 223 nm?
A 0.4564 g sample of a pure soluble bromide compound is dissolved in water, and all of the bromide ion is precipitated as AgBr by the addition of an excess of silver nitrate. The mass of the resulting AgBr is found to be 0.8815 g.
Calculate E for the cell. Assume all the H+ ions come from the first dissociation of H2SO4, which is complete.
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