Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Mole and Avagadro's Number

The mole is the SI base unit for amount of substance

Sponsored Links

The SI unit for amount of substance is the mole, defined as

  • the amount of substance that has an equal number of elementary entities as there are atoms in 12 g of carbon-12  (12C -  the isotope of carbon with standard atomic weight 12 by definition).

That number of elementary entities in carbon-12 is the Avogadro constant (number), NA.

    NA = 6.022141 1023 [molecules/mol]      

The mole is one of the base units of the SI, and has the unit symbol [mol].

Standard volume of 1 mole of an ideal gas at 1 atmosphere and 0°C is 22.414 liters.

See also Molecular Weight - Common Substances


Example: Number of molecules in 1 mole of hydrogen gas.

Hydrogen gas contains H2 molecules.  1 mole of a substance is 6.022141*1023 molecules of the substance.

So; 1 mole of hydrogen gas contains 6.022141*1023 H2-molecules


Example:
Number of molecules in ethyl alcohol

The molecular weight of ethyl alcohol is 46.07 kg/kmol and the number of molecules in 1 kg can be calculated as

n = (1 [kg] / 46.07 [kg/kmol])* 6.022 1023 [molecules/mol] * 1000 [mol/kmol]

   = 1.31*1025 [molecules]

Sponsored Links

Related Topics

Related Documents

Tag Search

  • en: mole molecular mass avagadros number constant
  • es: masa molecular mol avagadros nĂºmero constante
  • de: Maulwurf Molekularmasse avagadros Nummer konstant
Sponsored Links

Search the Engineering ToolBox

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate this page to
About the Engineering ToolBox!

Citation

This page can be cited as

  • Engineering ToolBox, (2008). Mole and Avagadro's Number. [online] Available at: https://www.engineeringtoolbox.com/mole-d_1255.html [Accessed Day Mo. Year].

Modify access date.

Customize Ads in the ToolBox

Make ads more useful in Google Ad Settings .

. .

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

4 20

Sponsored Links
.