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: An unknown compound was isolated, purified, and sent off for elemental analysis. It was suspected that the compound was a hydrocarbon of some type, so a carbon-hydrogen analysis was requested, and the following results were returned: %C, 59.94; %H, 12.08. A reasonable empirical formula was obtained by assuming that the remaining mass was due entirely to nitrogen, but the compound was never resubmitted for a nitrogen analysis.   a) Determine the empirical formula for the compound assuming that it consists of carbon, hydrogen, and nitrogen. Be sure to show your work, and write the empirical formula in the box provided.       The empirical formula is b) It was later determined that the other element in the compound was silicon, not nitrogen. You could repeat the above analysis based on carbon, hydrogen, and silicon, but a quick glance at the periodic table should allow you to immediately write the empirical formula based on the work you did in Part A. 1. What is the empirical formula for the compound assuming that it consists of carbon, hydrogen, and silicon? 2. Explain how you can determine the empirical formula based on the work you did in Part A without repeating the full calculation.

Problem

An unknown compound was isolated, purified, and sent off for elemental analysis. It was suspected that the compound was a hydrocarbon of some type, so a carbon-hydrogen analysis was requested, and the following results were returned: %C, 59.94; %H, 12.08. A reasonable empirical formula was obtained by assuming that the remaining mass was due entirely to nitrogen, but the compound was never resubmitted for a nitrogen analysis.

 

a) Determine the empirical formula for the compound assuming that it consists of carbon, hydrogen, and nitrogen. Be sure to show your work, and write the empirical formula in the box provided.

 

 

 

The empirical formula is

b) It was later determined that the other element in the compound was silicon, not nitrogen. You could repeat the above analysis based on carbon, hydrogen, and silicon, but a quick glance at the periodic table should allow you to immediately write the empirical formula based on the work you did in Part A.

1. What is the empirical formula for the compound assuming that it consists of carbon, hydrogen, and silicon?

2. Explain how you can determine the empirical formula based on the work you did in Part A without repeating the full calculation.