the mole unit 6. formula mass formula mass - (also called gram formula mass, molecular mass, formula...

Post on 22-Dec-2015

233 views

Category:

Documents

Embed Size (px)

TRANSCRIPT

• Slide 1
• The Mole Unit 6
• Slide 2
• Formula Mass Formula mass - (also called gram formula mass, molecular mass, formula weight, gram formula weight, molecular weight, gram molecular weight, molar mass, and molar weight): the mass of one mole of a compound, atom or ion.
• Slide 3
• So what is a mole??? http://ed.ted.com/lessons/da niel-dulek-how-big-is-a- mole-not-the-animal-the- other-one
• Slide 4
• Formula mass Formula mass the formula mass of any molecule, formula unit, or ion is the sum of the average atomic masses of all the atoms represented in its formula. Molar mass- the molar mass of a substance is equal to the mass in grams of one mole, or 6.02 x 10 23 particles of the substance. NOTE- These are 2 different terms but both are calculated the same way. Know these terms, but usually we will refer to the molar mass as just that, or we may use gfm (the gram formula mass)
• Slide 5
• Formula Mass Example: Find the formula mass of each of the following: arsenic trichloride: potassium sulfide:
• Slide 6
• Measuring Matter There are three ways to measure matter: by counting representative particles (typically molecules or formula units), by mass (in grams), or by volume (in liters for gases). The method used is usually chosen by the ease of each method and the information needed. Once a measurement has been made, it is possible to convert between the units for the other methods.
• Slide 7
• Measuring Matter 1 mole of a compound = formula mass (in grams) 1 mole of an element = 6.02 x 10 23 atoms of that element 1 mole of a compound = 6.02 x 10 23 representative particles 1 mole of a gas = 22.4 liters The mole is the link between grams, the number of representative particles and liters! For neutral compounds, the representative particle is either the molecule (covalent) or the formula unit (ionic). However, to simplify matters the term molecule is commonly used for both.
• Slide 8