PLEASE HELP!!!!!!!!! WILL MARK BRAINLIEST
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7.62 grams.
<h3>Explanation</h3>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