3.04 Molar Mass

• Introduction
• Learn
• Try It
• Task

Introduction

In the last lesson, you verified the Law of Conservation of Mass using an experiment. In this lesson, we will continue verify the Law of Conservation of Mass, only we will focus on verification using mathematical representations.

Remember, the Law of Conservation of Mass states that matter cannot be created or destroyed but it can change forms. This means that the mass of the reactants before a chemical reaction must be equal to the mass of the products after a chemical reaction. Instead of using measurements in a lab setting, this time we will be using the mass we can calculate from a balanced chemical equation.

 

Lesson Objectives

Following successful completion of this lesson, students will be able to... Define molar mass. Calculate molar mass of reactants and products given a balanced equation. Recognize an equation to calculate molar mass. Enduring Understandings Chemical reactions occur constantly all around us. During a chemical reaction, atoms are rearranged to produce new substances. The Law of Conservation of Mass states that matter is neither created or destroyed, and it can be verified both experimentally and mathematically. The above objectives correspond with the Alabama Course of Study: Physical Science standards: 5.