Barium sulfate is a compound used to assist in diagnosing medical problems through x-ray analysis and is 58.8% barium. what mass of barium is present in a 620 mg tablet of barium sulfate?

In barium sulfate, there is only 58.8% barium mass out of the total mass. From this description you can get this equation:

barium mass = barium sulfate mass * 58.8%

In this question, you are asked the mass of barium in 620mg barium sulfate. Then, the answer would look like this

barium mass = barium sulfate mass * 58.8%

barium mass = 620mg * 58.8%

barium mass = 364.56mg