Molar Mass and Percent Composition

Front

What is molar mass?

Back

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in a molecule.

Front

How do you calculate the molar mass of a compound?

Back

To calculate the molar mass, multiply the atomic mass of each element by the number of times that element appears in the compound, then sum all the values.

Front

What is the molar mass of CO₂?

Back

44 g/mol

Front

What is the molar mass of NaCl?

Back

58.443 g/mol

Front

What is the molar mass of Ba(C₂H₃O₂)₂?

Back

255.3 g/mol

Front

What is percent composition?

Back

Percent composition is the percentage by mass of each element in a compound, calculated by dividing the mass of the element by the total molar mass of the compound and multiplying by 100.

Front

How do you find the mass percentage of an element in a compound?

Back

To find the mass percentage, divide the mass of the element in one mole of the compound by the total molar mass of the compound, then multiply by 100.

Front

What is the mass percentage of Carbon in CO₂?

Back

27.27%

Front

Which statement is NOT true about molar mass?

Back

Molar mass is the sum of the number of all atoms in one molecule.

Front

What is the atomic mass of Carbon?

Back

12.01 g/mol