We are asked which of the following compounds has the highest mass percent of O a. Mn_{2}O_{3 }b. MnO c. Mn_{3}O_{2 }d. MnO_{2}

**T**o do that we’re going to use the **mass percent formula **shown below:

$\overline{){\mathbf{mass}}{\mathbf{\%}}{\mathbf{}}{\mathbf{O}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{O}}{\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}{\mathbf{Mn}}_{\mathbf{x}}{\mathbf{O}}_{\mathbf{y}}}{\mathbf{}}{\mathbf{x}}{\mathbf{}}{\mathbf{100}}{\mathbf{\%}}}$

First, we need to get the atomic weights of each element Mn and O using the periodic table and then calculate its molar mass. Then compute for the mass % of O.

Which of the following compounds has the highest mass percent of O?

a. Mn_{2}O_{3}

b. MnO

c. Mn_{3}O_{2}

d. MnO_{2}

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