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double arrow for type chemistry

How can set how long make the arrow for Chemical Equation ?

How can type "double arrows" (one right and one left over the right ,harpoon or any else style ) for type chemical balance?

double arrow for type chemistry

How can set how long make the arrow for Chemical Equation ?

How can type "double arrows" (one right and one left over the right ,harpoon or any else style ) for type chemical balance?