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?

Problem

What is the mass percent of chlorine in hydrochloric acid?

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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