An aqueous solution is 20.0 % by mass hydrochloric acid, HCl, and has a density of 1.10 g/mL.
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mass of solution 1.10 x 1000 g per 1dm^3
mass of HCl =1100 x 20/100=220 g per 1dm^3
HCl mol =220g/36.5gmol^-1 per 1dm^3
HCl molarity =6.027mols per 1dm^3
HCl molarity =6.027moldm^-3
HCl molarity =6.027mol l^-1
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