Reacting masses

• Chemistry
• Secondary Education

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CHEMISTRY 9

Stoichiometry: Reacting masses

Week 24

• calculate reacting masses in simple proportions.
• use the relationship amount of substance (mol) = mass (in g) / molar mass (in g/mol) to calculate:
• (a) amount of substance
• (b) mass
• (c) molar mass
• (d) relative atomic mass or relative molecular / formula mass.

Pre-class Activity

• Open the link: "Stoichiometry 2" on the Google Classroom.
• Complete the online simulation. 
• Send your work by clicking "Continue".
• Then, answer the next question.

REAL WORLD APPLICATION

WHAT YOU NEED TO KNOW

WHAT YOU NEED TO KNOW

WHAT YOU NEED TO KNOW

WHAT YOU NEED TO KNOW

Particle Ratio

WHAT YOU NEED TO KNOW

Suppose that you want to produce 20 molecules of ammonia. 

How many molecules of nitrogen do you need?

WHAT YOU NEED TO KNOW

How many moles of N₂ are needed to produce 5 moles of  NH₃?

WHAT YOU NEED TO KNOW

How many moles of H₂ are needed to produce 10 moles of  NH₃?

Pairwork - Activity 2 

• Open the link: "Stoichiometry 2" on the Google Classroom.
• Prepare your notebook.
• Complete Activity 2, Q1a to Q1e, Activity 3, Q1 and Q2 with your study partner.