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# equation of potassium iodide and hydrogen peroxide

Question:What is the activation energy of hydrogen peroxide (H2O2) and potassium iodide (KI)?

Question:What I know: vol of hydrogen peroxide sample is 8.72ml mass of hydrogen peroxide sample is 8.72g barometric pressure in lab is 764.29 mm HG temp in lab is 21 celcius vol of oxygen gas collected is 99.4 mL 1) How many moles of oxygen were collected n= .0821 x 284 divided by 1atm x 99.4 mL n=.23 moles that doesnt seem right :( 2) using the balanced equation (there is twice as much h202 needed as o2 produced). What is the molarity of the hydrogen peroxide solution? It would be double my answer in #1, but i dont think that answer is right 3) what is the mass percent hydrogen peroxide if the density is 1.00g/ml 4) calculate the volume of oxygen gas that would be produced upon the decomposition of 10ml of 30%(m/m) aqueous hydrogen peroxide solution. Assume the gas is collected at 1atm and 25 degrees celcius and density of hydrogen peroxide is 1.11g/mL.

Answers:I1) PV = nRT n = PV/RT. I think you got it upside down. Convert P to atm, V to L, if you are using R in L atm mol-1 K-1. ALWAYS write down the units and you won't go wrong. 2) Take number of moles in (1). Double it cos q tells you to. then use molarity x volume (L) = number of moles. That should get you started.

Question:What are the oxidation, reduction, and net ionic reactions for a mixture of hydrogen peroxide, sulfuric acid, and potassium iodide?