CHEM 120 Week 3 Lab Report – Stoichiometry | Chemistry Lab Report & Study Guide 2026/2027

M 120
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- Lab -Report
Stoichiometry.pdf!!!!!!!!!!!!!!!!!!!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~@@@@@@@@@@@@@@@@@@@@@@@@
- Stoichiometry.pdf!!!!!!!!!!!!!!!!!!!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~@@@@@@@@@@@@@@@@@@@@@@



Michael Heika



OL Lab 3: Stoichiometry: Avogadro’s number and molecular
calculations / Solution Preparation: From salt to solution

Learning Objectives:

· Explain the relationship between mass, molecular weight, and numbers of atoms or
molecules and perform calculations deriving these quantities from one another

· Perform mass-to-mass stoichiometric calculations via conversions to moles

· Identify the limiting and excess reagents in a chemical reaction

· Calculate the theoretical, actual and percent reaction yield

· Define Avogadro’s number and describe the mole quantification of matter

· Explain relationship between mass, molecular weight, and numbers of atoms or
molecules

· Perform conversion and derivations calculations using key molecular quantity
parameters

· Define Avogadro’s number and describe the mole quantification of matter

How many moles of sand grains has the Sahara desert? What is the only equation
you´ll ever need in chemistry? The short stoichiometry simulation will help you answer
those questions! Follow the footsteps of great chemists and learn about key molecular
parameters based on one and only star of chemistry calculations: Avogadro’s Law!

Concept mole and Avogadro’s Law:

Your first mission in this short simulation is to familiarize yourself with the concept of
mole and the way of counting molecules of substances using the one and only
Avogadro’s Law. You will learn how to convert huge numbers of particles into handy
Avogadro’s number, extensively used by all chemists around the world!



Chemical units relationship:

Next, you will explore the relationship between mass, molecular weight, and number of
atoms. This magical equation will enable you to perform derivations of molecular
quantity parameters for various chemical substances. You will feel like Marie Curie


This study source was downloaded by 884789 from cliffsnotes.com on 04-04-2025 16:08:24 GMT -05:00


M 120
CHEM- Week
120
CHEM -3Week
- 120
Lab -3
Report
Week
- Lab -3
Report
Stoichiometry.pdf!!!!!!!!!!!!!!!!!!!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~@@@@@@@@@@@@@@@@@@@@@@@@
- Lab -Report
Stoichiometry.pdf!!!!!!!!!!!!!!!!!!!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~@@@@@@@@@@@@@@@@@@@@@@@@
- Stoichiometry.pdf!!!!!!!!!!!!!!!!!!!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~@@@@@@@@@@@@@@@@@@@@@@
https://www.cliffsnotes.com//study-notes/24744256

,M 120
CHEM- Week
120
CHEM-3Week
- 120
Lab -3
Report
Week
- Lab -3
Report
Stoichiometry.pdf!!!!!!!!!!!!!!!!!!!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~@@@@@@@@@@@@@@@@@@@@@@@@
- Lab -Report
Stoichiometry.pdf!!!!!!!!!!!!!!!!!!!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~@@@@@@@@@@@@@@@@@@@@@@@@
- Stoichiometry.pdf!!!!!!!!!!!!!!!!!!!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~@@@@@@@@@@@@@@@@@@@@@@




analysing chemical dependencies of chemicals in her French laboratory! Part 1:
Complete the Labster lab: Stoichiometric calculations: Identify an unknown compound
using gravimetric analysis.

Glassware and quantitative transfer
Moving on to the second workbench, you will explore and determine what glassware
will be appropriate for you to use. Your lab guide and mentor, Dr. One, will walk you
through the process of preparing the solution. You will have the freedom to use the
equipment as you like, but only by following Dr. One’s instructions will you be successful
in making the right solution. To make sure you can always redo the essential steps of
the process, Dr. One will provide you with a fantastic reset button, so you can try again
if you make a mistake.

Solve the preparation
In the end, only by carefully ensuring that the right amount of water and ammonium
chloride is used can you make the correct solution. Are you prepared for solving how to
perform a Solution Preparation?



Part 1: Complete the Labster Lab: Stoichiometry: Avogadro’s number and
molecular calculations

Complete all activities and answer all questions within the lab and then complete the
questions below:

Purpose: Describe in complete sentences and in your own words, the purpose of this
experiment.

The purpose of this experiment is to deepen our understanding of the fundamental
concepts in chemistry, particularly those related to stoichiometry and the mole concept.

Observations: Record three observations from the simulation.

I. Learn how to use the salt to an H2O solution. We also learned how to
demineralized water does not contain minerals.

II. How and when to utilize certain tools in a labsuch as balancing a scale and a
volumetric flask

III. Learned about the reaction of the stoichiometry and how the number of moles
are formed.




This study source was downloaded by 884789 from cliffsnotes.com on 04-04-2025 16:08:24 GMT -05:00


M 120
CHEM- Week
120
CHEM -3Week
- 120
Lab -3
Report
Week
- Lab -3
Report
Stoichiometry.pdf!!!!!!!!!!!!!!!!!!!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~@@@@@@@@@@@@@@@@@@@@@@@@
- Lab -Report
Stoichiometry.pdf!!!!!!!!!!!!!!!!!!!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~@@@@@@@@@@@@@@@@@@@@@@@@
- Stoichiometry.pdf!!!!!!!!!!!!!!!!!!!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~@@@@@@@@@@@@@@@@@@@@@@
https://www.cliffsnotes.com//study-notes/24744256