Balance the following reaction. if a coefficient of "1" is required, choose "blank" for that box. c4h8 + br2 → c4h8br2
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C₄H₈ + Br₂ → C₄H₈Br₂

Explanation:

To balance a chemical equation, you need to ensure that the number of each element in the reactant side, matches the number of each element on the product side.

 Reactants                   Product

C₄H₈ + Br₂         →          C₄H₈Br₂

C = 4                                 C= 4

H = 8                                 H= 8

Br = 2                                Br = 2

Since they match up on both sides, the chemical equation is balanced, so we keep it as is.

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i just learnt this recently but i need to look through my notes again