**Mass percent composition** is also known as **percent** by **mass/****weight.**

**$\mathbf{\%}\mathbf{}\mathbf{by}\mathbf{}\mathbf{mass}\mathbf{=}\frac{\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{element}}{\mathbf{total}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{compound}}\mathbf{\times}\mathbf{100}$**

Why is mass percent composition useful?

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