Ch.3 - Chemical ReactionsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

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


What is the mass percent of chlorine in hydrochloric acid?


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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