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5 moles of chromium bromide and 5 moles of potassium sulfite. what is mol kbr 3...
An aqueous solution is 36.0% by mass potassium bromide, KBr. The mole fraction of potassium bromide in the solution is _________________
A chemist prepares a solution of potassium bromide (KBr) by measuring out 0.50 g of KBr into a 250. mL volumetric flask and filling to the mark with distilled water. Calculate the molarity of Br anions in the chemist's solution. Be sure your answer is rounded to 2 significant digits. mol x s ?
5. How many moles of KBr are required to react exactly with 2.66 moles of Fe(OH)3? Fe(OH), + 3 KBr 3 KOH + FeBrz 6. Potassium chlorate is a powerful oxidizing agent. If 45.0 g of potassium chloride is combined with 36.0g of oxygen, what is the limiting reactant, and the theoretical yield, in grams, of potassium chlorate, KCIO? Finally, if the actual yield is 68.4 g, what is the % yield? 2 KCI + 302 2 KCIO: limiting reactant:...
When 4.37 g of potassium bromide (KBr) is dissolved in 109 g of water in a styrofoam calorimeter of negligible heat capacity, the temperature drops from 25.00 to 23.34 °C. Based on this observation, calculate q for the water and ΔH° for the process, assuming that the heat absorbed by the salt is negligible. KBr(s) --> K+(aq) + Br- (aq) The specific heat of water is 4.184 J °C-1 g-1.
19. a. What mass of potassium bromide is needed to prepare a 250. mL of a 2.00 M KBr aqueous solution? Molar mass of KBr = 119.00 g/mol. Use dimensional analysis to calculate the mass. b. Describe the full process of how you would prepare this solution in a 250. mL volumetric flask. c. Calculate the concentration of the solution in question a. if more water was added to bring the solution to a final volume of 1000. mL. (Hint:...
A beaker contains 0.50 moles of potassium bromide dissolved to a total volume of 600.0 mL. How many moles of potassium bromide are in the beaker if 600.0 mL of water is added to the flask?
A) A solution contains 1.49×10-2 M potassium phosphate and 6.81×10-3 M potassium bromide. Solid silver acetate is added slowly to this mixture. What is the concentration of bromide ion when phosphate ion begins to precipitate? B) A solution contains 1.22×10-2 M chromium(III) acetate and 1.22×10-2 M aluminum nitrate. Solid sodium phosphate is added slowly to this mixture. What is the concentration of chromium(III) ion when aluminum ion begins to precipitate?
1)The mole fraction of chromium(II) sulfate, CrSO4, in an aqueous solution is 5.61×10-2 . The percent by mass of chromium(II) sulfate in the solution is %. 2) An aqueous solution is 40.0 % by mass hydrochloric acid, HCl, and has a density of 1.20 g/mL. The mole fraction of hydrochloric acid in the solution is . 3)An aqueous solution is 40.0 % by mass potassium bromide, KBr, and has a density of 1.37 g/mL. The mole fraction of potassium bromide in the...
5. A sample contains 64.8%of Potassium (K), 13.62% of Chromium (Cr), and 21.58% g of Oxygen (O). what is the empirical formula?0% to mass, mass to moles, divide by small, multiply:til whole) 1. How many grams of CO2 are produced when 2 mol CO (g) react with 1 mol 02 (g) as follows: 2CO (g) + O2 (g) &ут; 2CO2 (g) (Concepts used-limiting reactant and stoichiometry) 2. What is the geometry and bond angle for H2Se ? Does it have...
3. Highly oxidized chromium ("hexavalent chromium") in the form of K Cr207, potassium dichromate, can be converted to less toxic, still useful for chromium plating K Cr04, potassium chromate by heating it with potash, K2CO3. KCr207 + K CO3 à 2K CrO4 + CO What mass of potassium chromate is produced by the reduction of 100 g of potassium dichromate? [Molar masses: K, 39.0983 g: Cr, 51.996 g. 1 lb - 453.592 g]