Concentrated hydrochloric acid aqueous solution is 47.5% HCl by mass and has a density of 1.205. What volume (in mL) of concentrated hydrochloric acid must be used to prepare 10.0 L of .7436 M HCl (aq)?

and

What volume of water must be added to 50.0 mL of 6.00 M HCl in order to reduce its molarity to .400 M?

Thank you!

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