The following reaction represents the burning of wood:
{{left[ {{ ext{C}}_{6}}{{ ext{H}}_{10}}{{ ext{O}}_{5}} ight]}_{ ext{n}}}+ ext{a}{{left[ {{ ext{O}}_{2}} ight]}_{ ext{n}}} ext{b}{{left[ ext{C}{{ ext{O}}_{2}} ight]}_{ ext{n}}}+ ext{c}{{left[ {{ ext{H}}_{2}} ext{O} ight]}_{ ext{n}}}
Where a, b, c are the stoichiometric co-efficient. Then the value of a+b+c is a) 19 b) 17 c) 20 d) 18
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