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: A sample is composed of a mixture of NaBr and CuSO4.5H2O. A chemist decided to analyze the mixture by dehydrating it by heating it to 120°C for 12 hours which removed all of the water present. If a 6.

Problem

A sample is composed of a mixture of NaBr and CuSO4.5H2O. A chemist decided to analyze the mixture by dehydrating it by heating it to 120°C for 12 hours which removed all of the water present. If a 6.523 sample weighed 4.967 g after dehydration, what is the percentage of NaBr in the original hydrated sample?

 

a) 22.4

b) 33.9

c) 39.2

d) 79.7

e) none of the answers is within 5% of the correct answer.