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Use Coulomb's law to calculate the ionization energy in kJ/mol of an atom composed of a proton and an electron separated by 80.0 pm
What is the mass (in grams) of the precipitate when 7.1 g of iron(III) chloride reacts in solution with excess sodium phosphate
In a typical experiment, you drop a gelatin capsule containing 0.1458 g of an Al-Zn alloy sample into an HCl solution. a) Write the equations that represent the chemical reactions that take place after the capsule has dissolved in HCl?
The average concentration of calcium ion in seawater is 412 mg of calcium ion per kg of seawater. What is the molarity of the calcium ion if the density of the seawater is 1.025 g/mL?
Phosphoric acid, H3PO4, is a triprotic acid, for which Ka1=7.2 x 10-3, Ka2 = 6.3 x 10-8 and Ka3 = 4.2x 10-13. What is the value of Kb for hydrogen phosphate anion, HPO4 2-?
certain first-order reaction () has a rate constant of 1.00×10-2 at 45 . How many minutes does it take for the concentration of the reactant, , to drop to 6.25 of the original concentration?
Why do you think we need to convert the calcium carbonate to calcium chloride befoe we do our EDTA titrations? What specific condition in our titrations require this?
Stishovite is a high pressure form of SiO2 found in meteorite craters. While normal SiO2 has the quartz structure, in which each Si is coordinated by four O atoms
Calculate the percentage of chlorine in a sodium hypochlorite powder if 5.0 kg of powder gives off 2.3 kg of chlorine.
Carbon-14 has a half-life of 5730 years. In a plant fossil, you find that the C^14 has decayed to 1/16.0 of the original amount. How long ago was this plant alive. Express your answer numerically in years.
The solubility of barium fluoride, BaF2, is 3.15 x 10-3 M at 25 °C. Calculate the solubility product, Ksp, of both compounds.
Assume that the only amino acid in a particular protein that absorbs at 280 nm is tryptophan, and that this particular protein has 2 moles of tryptophan per mole of protein.
1.00 L solution containing 0.030 mol HA (pKa=2.50) and 0.020 mol NaA. Approximations [HA]=0.030 and [A-]=0.020 What is: Ka, FHA, FA, and approximate H
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