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# How many moles of O2 will be produced if 5 moles of the disinfectant hydrogen peroxide H2O2 decomposes?

A. 2.5 mol H2O2
B. 5 mol H2O2
C. 3 mol H2O2
D. 10 mol H2O2

This question is part of Stoichiometry QUIZ
Asked by Bethany.herman, Last updated: Sep 26, 2020

#### M. Parker

M. Parker, Internet Researcher, Houston

The answer is A.) 2.5 mol H2O2. It is through decomposition that the old elements are usually broken down into new pieces that can still be useful for the environment. It should also be a balanced equation where no elements are removed nor added. 2 moles of H2O2 will yield to 1 mole of O2.

So following this simple ratio, 4 moles of H2O2 will result in 2 moles of O2. For 1 mole of H2O2, it will yield to 0.5 moles of O2. Adding those up, 5 moles of H2O2 will yield to 2.5 moles of O2. You can write it in its formula: 5 moles H2O2 x (1-mole O2/2 moles H2O2) = 2.5 moles O2.

#### John Smith

John Smith

3 mol H2O2

Given: 5 mol H2O2 Unknown: ? mol O2 5 mol H2O2 x (1 mol O2/2 mol H2O2) = 2.5 mol = 3 mol O2 Although 2.5 mol O2 is technically correct, your answer must include the correct number of significant figures (which in this instance is 1). The answer is rounded to 3.