Okay i\'m having difficulty setting up these kinds ofproblems...i\'m not really

Question

Okay i'm having difficulty setting up these kinds ofproblems...i'm not really sure where to begin and so on...Here'sthe question: The concentration (M) of HCL in the solution prepared bydissolving 5.5 g of HCL in 200 g of water is _____________ M. The density of the solution is 0.79g/ml. Someone please help ASAP!!! Okay i'm having difficulty setting up these kinds ofproblems...i'm not really sure where to begin and so on...Here'sthe question: The concentration (M) of HCL in the solution prepared bydissolving 5.5 g of HCL in 200 g of water is _____________ M. The density of the solution is 0.79g/ml. Someone please help ASAP!!!

Explanation / Answer

This is a units-conversion problem The question asks for Molarity which is moles/L, so convert all thegiven values toward these 5.5 g HCl * (1 mol/36.46 g) = .15 moles   (molarcomponent done) The liquid (liters) is given as a mass instead of a volumetherefore we need a density (.79 g/ml) to convert it. 200g of water / (.79g/mL) = 253 mL * (1 L/ 1000 mL) =.253 liters (liters component done) finally, .15 moles/ .253 liters = .59 M In these types of problems it is best first to identify what youneed and what you have the try to form a link between the two.

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