One type of reaction used in the chemical industry is a substitution, where one atom or group is exchanged for another. In this reaction, an alcohol, 1-butanol, is transformed into 1-bromobutane by substituting Br for the –OH group in the presence of sulfuric acid. 

Calculate the % atom economy for the desired product, CH₃CH₂CH₂CH₂Br.

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CH,CH,CH,CH,OH + NaBr + H2SO4 → CH3CH₂CH₂CH₂Br + NaHSO4 + H₂O