Moles of Compounds
Home Up Mole Concept Mole-Gram Calculations Moles of Compounds Moles of Molecular Elements Additional Calculations

 

Moles of Compounds

The concept of a mole can be applied to compounds as well as elements. A mole of a compound is what you have when you weigh out, in grams, the formula weight of that compound. (Use the molecular weight if the compound is a molecular material.) For example, the formula weight for HF is 20.0. That means that one mole of HF weighs 20.0 grams, and you can use that relationship to convert back and forth between grams and moles.

For example, if you needed to change 15.0 g of HF to moles, you would simply multiply by the conversion factor that changes from gHF to moles HF. The relationship we just figured out is that 1 mole of HF weighs 20.0 g. Carrying out the calculations, we get 0.750 moles of HF. 15.0 g HF x 1 mole HF
    20.0 g HF 		= 0.750 mole HF

To emphasize that this is the weight of one mole of that chemical, some chemists call it the molar formula weight or the mole weight or even the molar mass.

 

Top of Page

Back to Course Homepage

E-mail instructor: Eden Francis

Clackamas Community College
©1998, 2002 Clackamas Community College, Hal Bender