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Calamine lotion contains a mixture of both zinc and iron oxides. A 1.022 g sample of dried calamine was dissolved in acid and diluted to 100.00 mL. Potassium fluoride (MW = 58.10 g/mol) was added to the solution to mask the iron. The pH was then adjusted and the solution was titrated with 0.1294 M EDTA. The solution required 77.42 mL to reach the equivalence point. Determine the percent ZnO (MW = 81.39 g/mol) in the sample.
Draw the correct molecular geometries of the following covalent compounds. Use the electronegativity differences between the atoms in each bond pair to determine the presence and direction of individual bond dipoles in each molecule.
an electron makes a transition from n = 7 to n = 5. what is the energy associated with this transition
Using the Nersnst Eqaution [E=E^0 + (RT/nF)In(a1/a2) ] in terms of teh partial pressures of the components (specify assumptions). Also, calculate the Gibbs Free energy of the complete rxn.
The half-life for the reaction at 550 C is 81.3 seconds. How long does it take for 78.5% of a phosphine sample to decompose?
A 100.0 mL aqueous sodium chloride solution is 13.6% NaCl by mass and has a density of 1.12 g/mL. What mass of solute would you add to make the boiling point of the solution 104*C
explain why DNA double stands separate by heating without degradation of the stands to their component molecules.
X-ray radiation falls in the wavelength region of 1.00E-11 to 1.00E-8 meters.
What type of mineral source (sulfide, oxide, halide, phosphate, silicate, carbonate, etc) are the following elements typically isolated from? Write the chemical formula for the source mineral (for example: silver, typical mineral source = silver s..
Standard Temperature Pressure and Volume, The respiratory rate of a person is 20 breathes per minute. If every average breath is about 310cm^3 of air at 22C and 740mmHG
Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts.
why is it important that cooling water in distilling apparatus enters conceder jacket at at the lower end and exit at the upper end, and not vice versa?
To prevent tank rupture during deep-space travel, an engineering team is studying the effect of temperature on gases confined to small volumes. What is the pressure of 3.20mol of gas measured at 251 degrees Celcius in a 1.75-L container assuming r..
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