The first number in a set such as 3H2O tells how many molecules of the substance there is. The number in subtext following the element tells how many atoms of the element there are. The letters represent elements from the Periodic table.
ex. 3H2O means 3 molecules, each containing 2 parts Hydrogen, 1 part Oxygen.
A chemicalequation is a symbolic representation of a chemical reaction.
The first-ever chemicalequation was diagrammed by Jean Beguin in 1615.
In a chemical reaction system the stoichiometric coefficient of the i-th component is defined as or where Ni is the number of molecules of i and ξ is the progress variable or extent of reaction.
The equation shows that two molecules of hydrogen react with one molecule of oxygen to form two molecules of water.
As the equation is now written, three oxygen atoms are produced from two, and four hydrogen atoms become only two.
The equation can now be written CH [right arrow]CO It is not yet balanced, since there are only two oxygen atoms shown as reactants and four as products.
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