You will investigate how to determine the number of particles in a sample based on measurements of mass and volume.
After completing this tutorial, you will be able to complete the following:
The mole is the SI unit used to measure the amount of representative particles in a substance. This unit is used to represent a specific number of objects, similar to the term dozen, representing 12 objects. Scientists measure small particles like molecules and atoms in moles. There are representative particles (molecules or atoms) in one mole of any substance. This number is known as Avogadro's number. The equality, 1 mole = particles, allows for the conversion of particles (molecules or atoms) to moles. Further, because it has been observed that 12 g of carbon-12 is equivalent to atoms of carbon-12, the mass of a mole of any substance is approximately equivalent to its average atomic mass from the Periodic Table. With the unit of the mole, conversions of mass to particles are possible when knowing the mass of the substance and its chemical composition. With this information, the amount of representative particles in any substance can be calculated.
|Approximate Time||20 Minutes|
|Pre-requisite Concepts||Learners should be familiar with the chemical equation, conservation of mass, kinetic molecular theory, and phases of matter.|
|Type of Tutorial||Concept Development|
|Key Vocabulary||Avogadros number, molar mass, mole|