Chemistry Assignment, Chemistry

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Hi. I''m in year 11 and writing a chemistry report on the concentration of HCl in brick cleaner. The product I''ve chosen is a 20L solution of HCl, 30% HCl. I have to find the concentration of HCl in this solution in moles per litre. The calculations I''ve done have given me an unnuasually high concentration, but I don''t know what, if anything, I''ve done wrong. Can you help?

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