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How many atoms of oxygen are there in 3.65 g of H2O2? Show all your work...

How many atoms of oxygen are there in 3.65 g of H2O2? Show all your work (including cancelling units) for full credit.

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Answer #1

Molar mass of Hydrogen peroxide (\small H_2O_2​​​​​​) = 34 g/mol

Given mass of \small H_2O_2 = 3.65 g

No of moles of \small H_2O_2

\small =\frac {\textup{Given mass of } H_2O_2} {\textup{Molar mass of } H_2O_2}

\small =\frac {\textup{3.65 g} } {\textup{34 g/mol} }= \bold {0.107}\textup{ mol } H_2O_2

We know that one mole of any substance contain avagadro's number of particles. Avagadro's no = \small 6.022*10^{23} . So 1 mol of \small H_2O_2 contain \small 6.022*10^{23} number of \small H_2O_2 molecules.

No of atoms of O in 3.65 g H2O2 = \small 1.29*10^{23} atoms

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