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Percentof hydrogen in compund = 1.47% (option D)To calculate the percent hydrogen by mass in chlorous acid, we need to find the mass of hydrogen in one mole of the compound and divide it by themolar massof the compound, then multiply by 100%.The molar mass of chlorous acid is:HClO2 = 1(1.008) + 1(35.453) + 2(15.999) = 68.452 g/molThemassof hydrogen in one mole of chlorous acid is:1(1.008) = 1.008 g/molTherefore, the percent hydrogen by mass in chlorous acid is:(1.008 g/mol / 68.452 g/mol) x 100% = 1.47%Therefore, the answer is D) 1.47%.To learn more aboutMolar mass, visit :brainly.com/question/22997914#SPJ11...