if 60.2 grams of Hg combines completely with 24.0 grams of Br to form a compound what is the percent compostiton of Hg in the compound

71.5 %

Explanation:

mercury + bromine ⟶ compound

Mass/g: 60.2 24.0

According to the Law of Conservation of Mass, the mass of the product must equal the mass of the reactants

Mass of product = 60.2 + 24.0

Mass of product = 84.2 g

The formula for percent composition is

% by mass = mass of component/total mass * 100 %

% Hg = 60.2/84.2 * 100

% Hg = 0.7150 * 100

% Hg = 71.5 %