Molecular mass

The video explains that unified atomic mass units are used to measure atomic mass, equivalent to 1/12th the mass of a carbon-12 atom. It also describes how to calculate the molecular mass of a chemical compound by summing the atomic masses of its constituent atoms.

What is the unified atomic mass unit based on?

• 1/14th the mass of a nitrogen atom

• 1/16th the mass of an oxygen atom

• 1/12th the mass of a carbon-12 atom

• 1/10th the mass of a hydrogen atom

Which element is used as a reference for defining the unified atomic mass unit?

• Oxygen

• Hydrogen

• Carbon

• Nitrogen

How is the molecular mass of a compound determined?

• By multiplying the atomic masses of all atoms

• By adding up the atomic masses of all atoms

• By subtracting the atomic masses of all atoms

• By dividing the atomic masses of all atoms

What is the first step in calculating the molecular mass of a compound?

• Subtracting the atomic mass of the lightest atom

• Finding the atomic mass of the heaviest atom

• Adding up the atomic masses of all atoms

• Identifying the number of molecules

Which of the following is true about molecular mass?

• It is the difference between the atomic masses of the heaviest and lightest atoms

• It is the average of the atomic masses of all atoms in a molecule

• It is the product of the atomic masses of all atoms in a molecule

• It is the sum of the atomic masses of all atoms in a molecule