When 2.95 ml of hydrogen peroxide solution decomposes, 36.9 ml of oxygen gas is

Question

When 2.95 ml of hydrogen peroxide solution decomposes, 36.9 ml of oxygen gas is evolved. The oxygen gas is collected over water at 24 celsius and at a total pressureof 762 mmHg. The density of the hydrogen peroxide solution is 1.01 g/ml and the solution contains 3.40% H2O2 by mass. The vapor pressure of water at 24 celsius is 22mmHg. Based on this data and information calculate the molar volume at STP.

Explanation / Answer

2H2O2---->2H2O+O2(gas) here we have weight of H2O2 solution=(1.01*2.95) gm=2.9795 gm. so,the amount of H2O2 present: (2.9795*3.4)/100 gms= (2.9795*3.4)/(100*34) mols.2 so,oxygen produces:2.9795*10^-3/2 mols. so,the volume of gas at standard conditions: (740/760)*(36.9*273)/(273+24)*1 ml=33.0255 ml which is the volume of 1.48975*10^-3 mols. so,volume of 1mol gas at standard conditions:22168.55 ml=22.2 litre(approx).

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