A solid organic sample weighing 0.4473 g contains covalently bound bromide as the only halogen. It was placed in a crucible with about one gram of fresh sodium metal. Subjecting the sample to a process known as sodium fusion, the covalently bound bromide was converted into sodium bromide. Excess sodium was decomposed by adding small portions of water which also dissolved the sodium bromide. The dissolved sodium bromide was reacted to 6 mL of 0.1 M AgNO3 to form AgBr. After filtering, the mass of the silver bromide produced was determined to be 40.2 mg. What is the percentage by mass bromine in the organic compound? Express your answer in 2 decimal places. No need to include the unit. Molar masses (in g/mol): AgBr =187.8; Br = 79.9; NaBr = 102.89; AgNO3 = 169.91