2. Based on moles of O2 evolved, calculate the molar concentration of the origin

Question

2. Based on moles of O2 evolved, calculate the molar concentration of the original 3% H2O2 solution (show calculations)

The Barometric pressure was given to us from our TA in Lab, I think it refers to the room? Then again I'm not sure

B. Effect of Temperature BATH TEMPERATURE33° Cc Buret read- Vol. of O ing (mL) (mL) Time O 6.0 2 4. 0 o.O 3.32 Total volume of O2 collected Barometric pressure a Vapor pressure of water at bath temiperature (see Appendix L) Slope 14 mm Hg ppendisx L) 1.2 lT mm Hg Compared with the rate found for solution 1, the rate is Using the ideal gas law, calculate the moles of O2 collected (show calculations) times faster. mol O Based on the moles of 02 evolved, calculate the molar concentration of the original 3% H2O2 solution (show calculations)

Explanation / Answer

Chemical equation for decomposition of H2O2,

2H2O2 --> O2 + 2H2O

So, 2 moles of H2O2 gives 1 mole of O2

moles of O2 : moles of H2O2 = 1 : 2

let x be the moles of O2 evolved,

then, moles of H2O2 = 2x

molar concentration of H2O2 = 2x/Volume of solution (L) = mol/L

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