We are asked to calculate for the **percent by mass (mass %) of S**in sulfuric acid (H_{2}SO_{4}) and to do that we’re going to use the **mass percent formula**shown below:

$\overline{){\mathbf{mass}}{\mathbf{}}{\mathbf{percent}}{\mathbf{=}}\frac{\mathbf{mass}\mathbf{}\mathbf{element}}{\mathbf{total}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{compound}}{\mathbf{\times}}{\mathbf{100}}{\mathbf{\%}}}$

For the percent by mass S, we’re going to rewrite the equation as:

A particular coal contains 2.55% sulfur by mass. When the coal is burned, it produces SO_{2} emissions which combine with rainwater to produce sulfuric acid.

Use the formula of sulfuric acid to calculate the mass percent of S in sulfuric acid.

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