Empirical Formula and Percent Composition 1

(Round molar mass to 1 decimal place)

The molar mass of HCl is (a)   grams

(Round molar mass to 1 decimal place)

Hydrogen makes up (a)   % of the mass of HCl

(Round molar mass to 1 decimal place)

Chlorine makes up (a)   % of the mass of HCl

(Round molar mass to 1 decimal place)

The molar mass of K₂CO₃ is (a)   grams

(Round molar mass to 1 decimal place)

Potassium (K) makes up (a)   % of the mass of K₂CO₃

(Round molar mass to 1 decimal place)

Carbon (C) makes up (a)   % of the mass of K₂CO₃

(Round molar mass to 1 decimal place)

Oxygen (O) makes up (a)   % of the mass of K₂CO₃

What is the empirical formula of a compound that is 63.52% iron and 36.48% Sulfur?

• Fe₂S

• FeS₂

• FeS

• Fe₃O₂

Determine the empirical formula of a compound containing 63.50 % silver, 8.25 % nitrogen, and the remainder oxygen.

• AgNO₃

• Ag₂NO₃

• AgNO₂

• Ag₂N₂O₅

A compound is 85.7 % carbon and 14.3 % hydrogen. Calculate the empirical formula.

• CH₂

• C₇H₁₄

• C₂H

• C₄H₇