Water Composition

The Hydrogen and Oxygen of Water

HYDROGEN + OXYGEN = WATER

The simple statement that water is made from hydrogen and oxygen doesn’t give us a very clear picture of what really goes into the creation of a molecule of water.

A quick look at the chemical equation for the formation of water tells us more.

It takes two molecules of the diatomic hydrogen gas, combined with one molecule of the diatomic oxygen gas to produce two molecules of water. In other words the ratio of hydrogen to oxygen is 2:1, the ratio of hydrogen to water is 1:1, and the ratio of oxygen to water is 1:2

 

There’s something more though that doesn’t show up in the equation. its Energy. The formation of water from it’s elements produces energy, in addition to water, a tremendous amount of energy, 572 kJ to be exact

 

This is an example of an exothermic reaction, a reaction that produces energy. It is also an example of what is called a combustion reaction, where a substance (in this case hydrogen gas) is combined with oxygen. You are probably familiar with this reaction through two tragic examples of the unleashed energy of the combustion reaction of hydrogen, the Hindenburg, and the space shuttle Challenger

 

Source from books:
Sastrohamidjojo, hardjono. 2005. Kimia Dasar. Yogyakarta: Gajah Mada University Press

Source from Internets:
Atoms, Molecules, Elements and compounds on http://www.chem.purdue.edu
Granger, Jill. 2002. The Hydrogen and Oxygen of Water (Article). On
http://witcombe.sbc.edu
Syvum Technologies. 1999. Atoms, Molecules, Elements and compounds on http://www.syvum.com

Source of pictures:
H2O dapat diakses pada http://us.123rf.com
Polar covalen bond pada Ensyclopedia britannica
Water molecule on http://rst.gsfc.nasa.gov

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