Problem: What is the mass percent of chlorine in hydrochloric acid?

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FREE Expert Solution

We are asked to calculate for the mass percent (mass %) of Cl in HCl. 


To do that we’re going to use the mass percent formula shown below:

mass% Cl = mass of Clmass of HCl x 100%


First, we need to get the molar mass of HCl.

Molar mass of HCl:

HCl       1 H   x   g/mol H      =   1.00 g/mol H        

           Cl  x 35 g/mol Cl    =   35.45 g/mol Cl 
                     
              Sum   =  36.45 g/mol HCl

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What is the mass percent of chlorine in hydrochloric acid?