Question

The mass percent composition of the compound formed when 3.48 grams potassium combine with 7.11 grams bromine is:

Answer 1

% by mass = (mass of component/total mass) x 100

We are given the masses of potassium (3.48g) and bromine (7.11g).

The total mass is = 10.59 g

% potassium = (3.48/10.59) x100

= 32.9%

%bromine = (7.11/10.59) x100

= 67.1%