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: Find the percent of KCl if a mixture of KCl and KNO3 is 44.2% potassium by mass.A. 12% B. 8% C. 20% D. 33% E. 40%

Problem

Find the percent of KCl if a mixture of KCl and KNO3 is 44.2% potassium by mass.

A. 12% 

B. 8% 

C. 20% 

D. 33% 

E. 40%

Solution

Determine the percent KCl in the mixture of KCl and KNO3 with 44.2% potassium by mass.

Step 1. Find the molar mass of KCl and KNO3

Step 2. Assume that we have 44.2 g K, find the moles of K

Step 3. Establish a two unknown equation and find the mass % of KCl 


Step 1. Find the molar mass of KCl and KNO3

KCl             1 K × 39.10 g/mol K = 39.10 g/mol
                   1 Cl × 35.45 g/mol Cl = 35.45 g/mol
                        Sum = 74.55 g/mol

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