Chapter 6, Problem 120CWP

When organic compounds containing sulfur are burned, sulfurdioxide is produced. The amount of SO₂ formed can be determined by the reaction with hydrogen peroxide:

$H_2{O}_2\left(aq\right)+S{O}_2\left(g\right)\to H_{2}S{O}_4\left(aq\right)$

The resulting sulfuric acid is then titrated with a standard NaOH solution. A 1.302-g sample of coal is burned and the SO₂ is collected in a solution of hydrogen peroxide. It took 28.44 mL of a 0.1000-M NaOH solution to titrate the resulting sulfuric acid. Calculate the mass percent of sulfur in the coal sample. Sulfuric acid has two acidic hydrogens.