The following units are common in chemistry problems. If you have trouble with these concepts please see your instructor for help.
Unit  Abbreviation  

Length:  meter  m 
Mass:  gram  g 
Volume:  liter  L 
Density:  g/mL or g/cm^{3}   
Concentration:  molarity  M 
Partial Pressure:  atmosphere  atm 
Amount:  mole  mol 
The following prefixes are useful abbreviations when working with very small or very large numbers. You might find it useful to memorize the most common prefixes: M, k, m, and µ.


Examples: One nm (nanometer) is 10^{9} m (that's small), and 2 kg is 2000 g (that's about a sixpack of your favorite beverage).
The mole is a fixed number of something.
If you have one mole of fish, you have 6.022x10^{23} fish (that's a lot of fish).
Equilibrium Practice Problems  
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