A student performed the experiment described in this module, using 4.00 mL of a 3.5% H2O2 solution with a density of 1.61 g mL-1. The water temperature was 25 ° C, and the barometric pressure in the laboratory was 30.40 in. Hg. After the student immersed the yeast in the peroxide solution, she collected 79.20 mL of O2. (8) Calculate the number of moles of H2O2 reacting.

A student performed the experiment described in this module, using 4.00 mL of a 3.5% H2O2 solution with a density of 1.61 g mL-1. The water temperature was 25 ° C, and the barometric pressure in the laboratory was 30.40 in. Hg. After the student immersed the yeast in the peroxide solution, she collected 79.20 mL of O2. (8) Calculate the number of moles of H2O2 reacting.

(Q65) Calculate the vapor pressure (in torr) at 30°C of a solution containing 155.1 grams of the nonelectrolyte glucose (C6H1206) dissolved in 821.4 grams of water. The vapor pressure of pure water at this temperature is 31.80 torr. (4 sf)

It is observed rhat 37.85 g of NaCl(MW=58.44g/mol) dissolves in 200.0 mL of water at 50 degrees Celsius. what is the molarity of NaCl in the solution. Assume that the volume of the solution does not change as the NaCL is added

A solution is prepared by dissolving 155.0 mL of methanol (CH3OH, density = 0.791 g/mL) in 250 mL of water (density 1.00 g/mL) to give a final solution volume of 350.0 mL. Calculate the (a) molarity of the solution, (b) %wt/wt, (c) %wt/vol, (d) %vol/vol

Please answer.

Forensic chemists use superglue to help them see fingerprints left behind at crime scenes. If cyanoacrylate, the main component of superglue, is vaporized it will be attracted to the oils left behind after someone touches an object. Forensic investigators will then rinse the print with a solution of europium chloride hexahydrate, EuCl3- 6 H₂O which fluoresces when exposed to ultraviolet light. If 0.447 g of europium chloride hexahydrate is dissolved in enough water to make 660.0 mL of solution, what is the molarity of the resulting solution? i x 10 i M

Hydrogen sulfide can be removed from natural gas byreaction with excess sodium hydroxide. Name the salt thatis produced in this reaction. (Note: Hydrogen sulfide losesboth its hydrogen atoms in the course of this reaction.)