Calculate the percent composition of barium in the compound barium chloride, BaCl2.

The percent composition of barium in barium chloride is 65.9%

calculation

percent composition = molar weight of barium/molar weight of barium chloride x 100

from periodic table the molar weight of barium = 137.3

and the molar weight of BaCl2 = 137.3 + (35.5 x 2) = 208.3

% composition is therefore = 137.3/208.3 x 100=65.9%