Question

# Photosynthesis of a carbohydrate in plants is given by chemical equation: $$6C{ O }_{ 2 }+6{ H }_{ 2 }O\longrightarrow { C }_{ 6 }{ H }_{ 12 }{ O }_{ 6 }+6{ O }_{ 2 }$$If you have net result as:$$6C{ O }_{ 2 }+6{ H }_{ 2 }O\longrightarrow { C }_{ 6 }{ H }_{ 12 }{ O }_{ 6 }+6{ O }_{ 2 }$$Check whether this reaction is correct or not.

Solution

## No, $${O}_{2}$$ (product is from $${ H }_{ 2 }O$$ (reactant), hence $$12{ H }_{ 2 }O$$ is taken as reactant. It is confirmed by taking isotopic $${O}^{18}$$ when all $${O}^{18}$$ appear in $${O}_{2}$$.$$6C{ O }_{ 2 }+6{ H }_{ 2 }{ O }^{ 18 }\longrightarrow { C }_{ 6 }{ H }_{ 12 }{ O }_{ 6 }+6{ H }_{ 2 }O+6{ { O }_{ 2 } }^{ 18 }$$Biology

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