A salt contains only barium and one of the halide ions. A 0.158g sample of a...

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Question

A salt contains only barium and one of the halide ions. A 0.158g sample of a salt was dissolved in water, and an excess of sulphuric acid was added to form barium sulphate, which was filtered, dried and weighed. Its mass was found to be 0.124g. What is the formula of the barium halide?

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