I-4. Chemistry Units

Common UnitsPrefixesThe Mole

Introduction

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

 UnitAbbreviation
Length:meterm
Mass:gramg
Volume:literL
Density:g/mL or g/cm3--
Concentration:molarityM
Partial Pressure:atmosphereatm
Amount:molemol


Prefixes

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 .

prefixnamefactor
Ttera1012
Ggiga109
Mmega106
kkilo103
        
prefixnamefactor
mmilli10-3
micro10-6
nnano10-9
ppico10-12
ffemto10-15

Examples: One nm (nanometer) is 10-9 m (that's small), and 2 kg is 2000 g (that's about a six-pack of your favorite beverage).


The Mole

The mole is a fixed number of something.

If you have one mole of fish, you have 6.022x1023 fish (that's a lot of fish).


Equilibrium Practice Problems
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