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Mole Concept in Chemical MeasurementsContents |
Background
The term "molar" refers to the amount of substance (in moles) contained in a liter of solution - in oceanography a liter of seawater. A mole is the amount of pure substance containing the same number of chemical units as there are atoms in exactly 12 grams of carbon-12 (i.e., 6.023 X 10^23). A mole is sometimes called a gram-atom (g-atom) in the older literature, a term that should not be used today.
- The amount of pure substance of an element constituting a mole is the Atomic Weight in grams
- The amount of pure substance of a compound constituting a mole is the molecular weight, the sum of the atomic weights of all constituent atoms, in grams
Equivalencies Table
| Compound, Element or Ion Name | Molecular, Atomic or Ionic Weight | Contents of a 1 molar solution | Contents of a 1 micromolar (umolar) solution |
| Ammonium, NH3 | 17.03 | 17.03 grams (g) in 1 liter (dm3) of seawater (sw) | 17.03 ug in 1 dm3 sw |
| Nitrate, NO3 | 62.00 | 62.00 g in 1 dm3 sw | 62.00 ug in 1 dm3 sw |
| Nitrite, NO2 | 46.01 | 46.01 g in 1 dm3 sw | 46.01 ug in 1 dm3 sw |
| Oxygen, O2 | 32.00 | 32.00 g in 1 dm3 sw | 32.00 ug in 1 dm3 sw |
| Phosphate, PO4 | 94.97 | 94.97 g in 1 dm3 sw | 94.97 ug in 1 dm3 sw |
| Silicate, SiO4 | 92.08 | 92.08 g in 1 dm3 sw | 92.08 ug in 1 dm3 sw |
Subsections of this Article
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Information about this article
Short title: Mole Concept
Description: none
Expertise level: beginner
Author: Murray.Brown
Approval status: approved
Approved by: Murray.Brown
Last change: 2009-10-12
Subsection of: Chemical Oceanographic Measurements
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