Dilute aqueous hydrogen peroxide is used as a bleaching agent and for disinfecting surfaces and small cuts. its concentration is sometimes given as a certain number of "volumes hydrogen peroxide," which refers to the number of volumes of o2 gas, measured at stp, that a given volume of hydrogen peroxide solution will release when it decomposes to o2 and liquid h2o. how many grams of hydrogen peroxide are in 0.125−l of 20 "volumes hydrogen peroxide" solution

7.62 grams.

According to the question, 0.125 L of the 20 "volumes hydrogen peroxide" solution would decompose to produce of oxygen gas.

The question indicates that the volume of here is measured under STP, which means that every of gas would have a volume of . There would thus be of molecules in the 2.5 L of produced.

It takes two moles of hydrogen peroxide to produce one mole of oxygen. The unknown solution must contain 0.224 mol of hydrogen peroxide to produce all the 0.112 mol of oxygen.

Hydrogen peroxide has a formula mass of , meaning that each mole of it would have a mass of 34.02 grams. 0.224 mol of would thus have a mass of