Question

Balance the Chemical reaction
2CH4—C2H6+3H2O


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Answer 1

2CH4 - - - > C2H6+3H2O

2C2

8H12

0O3

6CH4 + 3O - - - > 3C2H6+3H2O

6C6

24H24

3O3

I added oxygen to the reactant side because I presumed this must be a combustion of methane; since, H2O is made in the product side.

Hope this helps!