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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



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