Some things to consider in the equation of Chemistry

Some things to consider in the equation , namely :
1 . Coefficient
Numbers are on the left formula reactants and reaction products are called coefficients . Each coefficient in the equation represents the number of units of each substance in the reaction
2 . Steps Balance Chemical Reactions
Equalizing the reaction equation can be done with the following steps :
a. Set the coefficient of one of the substances , which usually has the most complex formula equal to one , while other substances are given coefficients while the form of letters .
b . First balance the elements directly related to the coefficients of the given substance .
c . Balance the other elements .
example
The reaction of methane ( CH4 ) with oxygen gas to form carbon dioxide gas and water vapor .
Step 1 :
Write down the formula of the reactants and the reaction proceeds as follows :
CH4 ( g ) + O2 ( g ) → CO2 ( g ) + H2O ( g )
Step 2 : Equalization
1 . Specify coefficient of CH4 = 1 , while the other with the letter CH4 ( g ) + AO2 ( g ) → bCO2 ( g ) + CH 2 O ( g )
2 . Balance the atoms C and H. Note the number of C atoms on the left = 1 ; mean number of C atoms on the right = b = 1 . Notice the number of H atoms on the left = 4 ; mean number of H atoms on the right = 2c , meaning 2c = 4 , or c = 2
3 . Balance the O atoms , the number of O atoms on the left = 2a . On the right side = 2 + 2 = 4 , then 2a = 4 or a = 2 . Thus obtained the following equation : CH4 ( g ) + 2O2 ( g ) → CO2 ( g ) + 2H2O ( g )

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