CHEMISTRY - Matter - In Depth Atomic Mass Units

The video tutorial explains the concept of atomic mass, focusing on the relative isotopic mass. It uses helium as an example to introduce the mass number and explains how the carbon-12 atom became the standard reference for atomic mass. The tutorial details the calculation of atomic mass using the carbon-12 standard, providing examples with helium, hydrogen, and fluorine. It concludes with a practice exercise on calculating the atomic mass of nitrogen, reinforcing the concept that 1 atomic mass unit is 1/12 of the mass of a carbon-12 atom.

What is the mass number of a helium atom?

Explain the significance of the carbon-12 atom in relation to atomic mass.

How is one atomic mass unit defined?

What is the relative isotopic mass of a nitrogen atom?

Describe how the relative isotopic mass of an atom is determined.