Hydrogen peroxide(H2O2) slowly decomposes to form water and oxygen gas. Calculate the mass of Hydrogen peroxide needed to obtain 0.460L of oxygen gas at STP

Answer 1

2H2O2 ==> 2H2O + O2
mols O2 gas = 0.460L/22.4 = ?
Using the coefficients in the balanced equation, convert mols O2 gas to mols H2O2.
Now convert mols H2O2 to grams. g = mols x molar mass.