Molecular weight

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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 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 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]].  
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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 [[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:  
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If you were to calculate the MW of glucose;  
 
If you were to calculate the MW of glucose;  
  
The molecule is C<sub>6</sub>H<sub>12</sub>O<sub>6</sub><br>  
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The molecule is C<sub>6</sub>H<sub>12</sub>O<sub>6</sub><br>
  
The [[Atomic_mass|atomic mass]] of carbon is 12.  
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The [[Atomic mass|atomic mass]] of carbon is 12.  
  
 
The atomic mass of hydrogen is 1.  
 
The atomic mass of hydrogen is 1.  
  
The atomic mass of oxygen is 16.<br>  
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The atomic mass of oxygen is 16.<br>
  
 
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

Revision as of 11:06, 5 December 2017

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

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