Skip to content
Chemistry Steps

Chemistry Steps

Chemistry Steps
  • Topics
  • Practice Problems
  • Study Guides
  • Organic Chemistry
  • Log In
    • Register
Chemistry Steps
  • Topics
  • Practice Problems
  • Study Guides
  • Organic Chemistry
  • Log In
    • Register

Atoms, Molecules, and Ions

Percent Composition and Empirical Formula Practice Problems

by Dr. S. Gevorg
empirical formula from percentage of elements

In the previous post, we talked about the percent composition and its use for determining the empirical and molecular formulas of compounds. Remember, the percentage composition shows the amount of each element in a compound expressed as a mass percent … Read more

Categories Atoms, Molecules, and Ions Leave a comment

How To Convert Grams To Number of Atoms

by Dr. S. Gevorg
Converting atoms to grams factors

In the previous two posts, we discussed converting grams to moles and grams to molecules. For the moles, here is what we do: first look up the molar mass in the periodic table, set up the correct conversion factor, and … Read more

Categories Atoms, Molecules, and Ions, Stoichiometry Leave a comment

Grams to Molecules and Molecules to Mass

by Dr. S. Gevorg
calculating number of atoms from mass plan

In the previous post, we discussed converting grams to moles. Remember, the first thing was to look up the molar mass in the periodic table, set up the correct conversion factor, and finally do the multiplication. Here is a short … Read more

Categories Atoms, Molecules, and Ions, Stoichiometry Leave a comment

How To Convert Grams To Moles

by Dr. S. Gevorg
Converting grams to moles easy sumarry steps

To convert the grams to moles, we need to know the molar mass of the substance. Remember, molar mass (M) is the mass of one mole of atoms/molecules/ions expressed in g/mol. To calculate it we are always going to need a … Read more

Categories Atoms, Molecules, and Ions, Stoichiometry Leave a comment

Writing Chemical Formulas For Ionic Compounds

by Dr. S. Gevorg
MgI2 formula crossing the charges to subscript

Some Patterns of Ions To write the name of an ionic compound based on its name, we first need to remember the valency and the names of the common ions. Let’s start with the alkali and alkaline earth metals. These … Read more

Categories Atoms, Molecules, and Ions Leave a comment

Calculating The Percent Abundance of Each Isotope 

by Dr. S. Gevorg

In the previous post, we have seen that the average atomic mass is calculated by the weighted average of the atomic masses of all the isotopes. The formula we can use for this calculation can be written as:   Average … Read more

Categories Atoms, Molecules, and Ions Leave a comment

How To Calculate The Average Atomic Mass

by Dr. S. Gevorg
How To Calculate The Average Atomic Mass

In the previous post, when talking about isotopes, we mentioned that the mass given for elements in the preperiodic table is not a whole number. For example, the mass of potassium is given as 39.098, and this is because that … Read more

Categories Atoms, Molecules, and Ions Leave a comment

What Are Isotopes?

by Dr. S. Gevorg
atomic number and mass number

Isotopes are atoms of the same element that have the same atomic number but different mass numbers. Now, because the atomic number represents the number of protons, we can also say that isotopes have the same number of protons but … Read more

Categories Atoms, Molecules, and Ions Leave a comment

How To Calculate The Number of Protons, Neutrons, and Electrons 

by Dr. S. Gevorg

Before we start with some examples of calculating the number of protons, neutrons, and electrons, let’s recall what information we get about a particular element from the periodic table. For example, if we look up potassium, K in the periodic … Read more

Categories Atoms, Molecules, and Ions Leave a comment

Mass, Moles, and Number of Particles Practice

by Dr. S. Gevorg

In this set of practice problems, we will work on molar calculations such as converting between Mass, Moles, and Number of Ions and Atoms. For all the problems, calculating the molar mass is not shown as it should be a … Read more

Categories Atoms, Molecules, and Ions, Stoichiometry Leave a comment
Older posts
Page1 Page2 Page3 Next →

General Chemistry Study Guides

Preparing for orgo organic chemistry after General Chemistry

Chemistry Steps LLC

General Chemistry Articles, Study Guides, and Practice Problems.

 

5900 Balcones Drive, Austin, TX 78731

info@chemistrysteps.com

About

Terms

Privacy Policy

Contact

Feedback

Copyright © 2016 - 2023 Chemistry Steps
Next Page »