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A 0.1500 g sample of pure ZnCl2 x nH2O was place on an ion exchange column in the H+ form. The H+ released in the eluate required 16.98 mL of 0.1024 M NaOH to reach a phenolphthalein end point. Calculate the percent zinc in the sample. Calculate the value of n for the data in the equation (the n on the H20).
according to the law of conservation of mass if the products of a reaction have a mass of 64.0 grams then the total
In a lab experiment demonstrating Beer's law, the absorbance of a 0.15 M sample of solution A was 0.750 at the wavelength of maximum absorbance. What is the molar absorptivity (extinction coefficient) if the path length is 1 cm
Why does the water solubility of the acidic compound change when going from the aqueous base to the aqueous acid? pls write the eq'n to illustrate this change.
how many moles of ammonium sulfate can be made from the reaction of 30.0 mol of nh3 with h2so4 according to the
The cell reaction is spontaneous with a standard cell potential of 5.85 V. B. The cell reaction is spontaneous with a standard cell potential of 0.11 V. C. The cell reaction is nonspontaneous with a standard cell potential of -0.11 V. D
Calculate the partial pressure of oxygen produced from 1.00L of 0.600M dinitrogen pentoxide solution at 45 degrees celsius over a period of 20.0hours if the gas is collected in 10.0L container. (Assume that the products do not dissolve in chlorofo..
to what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time? Assume ideal behavior for all gases.
Describe two different methods one could employ to determine if two white solids, that have identical melting points, are the same compound or two different compounds
the pressure inside a particular 5.00 l bottle of gas must be 1 atm or less in order to open the bottle cap. to what
A 23.45g piece of iron and a 29.95g piece of gold at 100.00C were dropped into 530ml of water at 16.05C. The molar heat capacities of iron and gold are 25.19 (j/mol x C) and 25.41 j/(mol x C). respectively. What is the final temperature of water a..
in the electrolysis of a sodium chloride solution, what volume of H2 is produced in the same time it takes to produce 257L of Cl2, with both volumes measured at 50 celcius degrees and 2.50atm
A radioactive element has a half-life of 2.2 hours. How many hours will it take for the number of atoms present to decay to one-sixteenth of the initial value? Show your calculations
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