Molecular weight: Difference between revisions
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The molecular weight (MW), or relative molecular weight, of a [[Molecule|molecule]] can be found by the addition of all the [[ | The molecular weight (MW), or relative molecular weight, of a [[Molecule|molecule]] can be found by the addition of all the [[Atomic weight|atomic weights]] of all the [[Atom|atoms]] that are present in the [[Molecule|molecule]] these can only be molecules which actually exist, and are joined together with [[Covalent bond|covalent bonds]]. The [[Atomic weight|atomic weight]] data can be found on the [[Periodic table|periodic table]]. The molecular weight can be important in helping to find [[Concentration|concentration]], after finding the number of [[Moles|moles]]. | ||
An example: | An example: | ||
If you were to calculate the MW of glucose; | If you were to calculate the MW of [[Glucose|glucose]]; | ||
The molecule is C<sub>6</sub>H<sub>12</sub>O<sub>6</sub | The molecule is C<sub>6</sub>H<sub>12</sub>O<sub>6</sub> | ||
The [[Atomic mass|atomic mass]] of carbon is 12. | The [[Atomic mass|atomic mass]] of carbon is 12. | ||
| Line 11: | Line 11: | ||
The atomic mass of hydrogen is 1. | The atomic mass of hydrogen is 1. | ||
The atomic mass of oxygen is 16. | The atomic mass of oxygen is 16. | ||
So to calculate the molecular weight of glucose you would do. (12x6)+(1x12)+(16x6) = 180 | So to calculate the molecular weight of glucose you would do. (12x6)+(1x12)+(16x6) = 180 | ||
Latest revision as of 16:05, 24 October 2018
The molecular weight (MW), or relative molecular weight, of a molecule can be found by the addition of all the atomic weights of all the atoms that are present in the molecule these can only be molecules which actually exist, and are joined together with covalent bonds. The atomic weight data can be found on the periodic table. The molecular weight can be important in helping to find concentration, after finding the number of moles.
An example:
If you were to calculate the MW of glucose;
The molecule is C6H12O6
The atomic mass of carbon is 12.
The atomic mass of hydrogen is 1.
The atomic mass of oxygen is 16.
So to calculate the molecular weight of glucose you would do. (12x6)+(1x12)+(16x6) = 180