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Calamine, which is used for relief of skin irritations, is a mixture of zinc and iron oxides. A 1.056-g sample of dried calamine was dissolved in acid and diluted to 250.0 mL. Potassium fluoride was added to a 10.00-mL aliquot of the diluted solution to mask the iron; after suitable adjustment of the pH, Zn2+ consumed 38.37 mL of 0.01133 M EDTA. A second 50.00-mL aliquot was suitably buffered and titrated with 2.30 mL of 0.002647 M ZnY2– solution:
Fe3+ + ZnY2- FeY- + Zn2+
Calculate the percentage of ZnO and Fe2O3 in the sample.
A study of the rate of formation of iodine by the reaction 2I(g) > I2(g) in the presence of argon. The following data was obtained... Determine
I) The rate law
Ii) Calculate the rate constant and give its units
acetylene gas(C2H2)burns in oxygen-producing gaseous carbon dioxide and steam
an organic compound was analysis and found to contain 5.359 gram of carbon , 0.909 gram of hydrogen and three find the empirical and molecular formula if relative mass is 88
A 5.00 L of a gas is collected at 100. K and then allowed to
expand to 20.0 L. What must the new temperature be in order
to maintain the same pressure (as required by Charles' Law)?
if 0.75 grams of Ca(OH)2 is used in the reaction to determine the following:?
a. number of moles of HCl (MM= 36.46 g/mol) needed to completely react with Ca(OH)2. the molar mass of Ca(OH)2 is 74.10 g/mol.
b. mass of CaCl2 (MM= 110.98 g/mol) formed in the reaction
If it takes 50 mL of 0.5 M KOH solution to completely neutralize 125 mL of nitric acid solution (HNO3), what is the concentration of the nitric acid solution?
The electron configuration of Cu
The density of ethanol is 0.789 g/ml at 20⁰C. Find the mass of a sample of ethanol that has a volume of 150.0 ml at this temperature
What does ideal gas law predicts that the molar volume is equal to
