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Chemical equations Check your score
  Play           Question 144 of 161 in this category.    

The following chemical equations represent the complete combustions of hydrocarbons. Which one correctly represents the complete combustion of ethane?
CH4  +  2O2      CO2  +  2H2O
CH4  +  3O2      CO2  +  4H2O
2C2H6  +  7O2      4CO2  +  6H2O
C2H6  +  2O2      CO2  +  2H2O

  * Quiz question created by Beka on 23 July 2005 at 4:16pm



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Chemical equation for the complete combustion of ethane

 dah lama tinggal dah tak ingat.. ada sape2 boleh terangkan tak?

The answer is:

2C2H6  +  7O2    4CO2  +  6H2O

Left side of equation:

Carbon atoms = 22 = 4
Hydrogen atoms = 26 = 12
Oxygen atoms = 72 = 14

Right side of equation:

Carbon atoms = 41 = 4
Hydrogen atoms = 62 = 12
Oxygen atoms = 42 + 61 = 14

The number of atoms for each element is the same before and after chemical reaction. Hence, the chemical equation is balanced!


See also this explanation by Beka (in Bahasa Melayu) - Pembakaran lengkap etana

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