## Chemistry and Chemical Reactivity (9th Edition)

$77.22\%$
Number of moles of barium sulfate: $0.2070\ g\div 233.38\ g/mol=0.8869\ mmol$ From stoichiometry, same number of moles of saccharin: $0.8869\ mmol\times 183.18\ mg/mmol=162.5\ mg$ Mass percent: $162.5/210.4\times 100\%=77.22\%$