Journal Entry:

How many moles of Lead (II) iodide, PbI₂, are there in a 25.0 gram sample? How many atoms of lead, Pb, are in the sample? 

Learning Intentions

• You will learn how to calculate molar mass for a formula.  

• You will learn how to use molar mass to convert between mass and moles.

• You will learn what Avogadro's number is and how to use it to convert to number of particles.

Closing Task:

You can use molar mass as a conversion factor to convert between moles and grams.

You can use Avogadro's number to convert between moles and number of particles.

Content Standards being covered:

LO 1.1 Calculate quantities of a substance or its relative number of particles using dimensional analysis and the mole concept..