Balanced equation: 2H2O2 → 2H2O + O2
Solve for PO2 → moles O2 → moles H2O2
Using Dalton’s Law: PO2
• at 25.0°C, Pwater = 23.78 mm Hg (vapor pressure)
Ideal Gas equation: moles O2
n = 1.97 x10-3 mol O2
Mole to mole comparison: 2 moles H2O2 forms 1 mole O2
Hydrogen peroxide (H2O2) decomposes in the presence of a catalyst to form water and oxygen. The catalyst is added to 5.00 mL of a hydrogen peroxide solution at 25.0˚C, and 49.5 mL of gas is collected over water at a total pressure of 763.6 mmHg.
How many grams of hydrogen peroxide were in the original sample?
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