Answer:
(a)57.48 percent (b) 29.45 percent
Explanation:
copper(II) bromide is 29.45 percent copper and 71.54 percent bromine. so the first element percentage composition is always the percentage composition of the compound.
that goes same with sodium hydroxide. it is 57.48 percent sodium, 40 percent oxygen, and 2.52 percent hydrogen.
