Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Chapter 3: Chemistry

Calculations With Chemical Formulas and Equations

What is Molecular Mass ( Molecular Weight)? Molecular Mass (Molecular Weight) is the weight of ALL the atoms in a molecule. Ex. The molecular Mass of H2O is 18.0 amu because 2*1.0 is from 2 atoms of hydrogen + 16.0 amu from 1 atom of Oxygen atom.
What is a Mole? A mole is the quantity of a given substance that contains as many molecules or formula units as the number of atoms exactly 12g of Carbon-12.
What is Avogadro Number? The number that tells the number of atoms in a sample. For ex. 1 mole of a ethanol contains 6.02 * 10*23 ethanol molecules.
What is molar Mass? Molar Mass is the mass of one mole of the substance. Ex. Carbo-12 has a molar mass of exactly 12g/mole.
How to determine a newly found compound? 1st find the chemical formula by mass percentage.
What are the steps to converting moles of a substance to grams? Use what you are given as moles than convert to grams.
How do you calculate the number of molecules in a given mass? cal. 3.46 g. of HCl to molecules. First you will start with grams than moles-than- molecules using Avogadro number.
Created by: njackson9