On Level % Composition and Empirical/Molecular Formulas

Front

What is the chemical formula for magnesium bromide?

Back

MgBr₂

Front

Which element has a greater atomic mass in carbon monoxide (CO)?

Back

Oxygen

Front

What is the empirical formula of a compound containing 0.473 g of nitrogen, 33.8% carbon, and 1.41% hydrogen by mass?

Back

C₂HNO₂

Front

What is the molecular formula for glycerol with a molar mass of 92.09 g/mol and percent composition of 39.12% C, 8.75% H, and 51.12% O?

Back

C₃H₈O₃

Front

What percentage of the total atomic mass of carbon monoxide (CO) is composed of carbon?

Back

43%

Front

Define percent composition in chemistry.

Back

Percent composition is the percentage by mass of each element in a compound.

Front

What is the difference between empirical and molecular formulas?

Back

Empirical formula shows the simplest whole-number ratio of elements, while molecular formula shows the actual number of atoms of each element in a molecule.

Front

How do you calculate the percent composition of an element in a compound?

Back

Percent composition = (mass of element in 1 mole of compound / molar mass of compound) × 100%.

Front

What is the molar mass of carbon (C)?

Back

12.01 g/mol.

Front

What is the molar mass of oxygen (O)?

Back

16.00 g/mol.