The elements of Group 7, the halogens, have many important uses. Fluorine is used to make sulfur hexafluoride, $$\(\mathrm{SF}_{6}\)$$, a gas which is used as an insulator in electrical equipment. Chlorine is used as a bleach and as a disinfectant in water treatment. Bromine is used to make organic chemicals that are used as fire retardants. lodine has been used in the catalyst in the manufacture of ethanoic acid. The structure of a fire retardant is shown. Calculate the percentage by mass of bromine in this fire retardant. Give your answer to an appropriate number of significant figures. (2)

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