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: Place the following gases in order of decreasing average molecular speed at 315 K : CO, SF6, H2S, Cl2, HBr.

Problem

Place the following gases in order of decreasing average molecular speed at 315 K : CO, SF6, H2S, Cl2, HBr.

Solution

We’re being asked to arrange the gases in order of decreasing the average molecular speed at 315 K.


Recall that the speed of a gas is related to its mass. The greater the molar mass of a gas, then the lower is its molecular speed.


So for each gas, we will calculate their molar mass and arrange their average molecular speed based on molar mass.


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