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: Which of the following gases has the lowest average speed at 25°C?a. H2Seb. PH3c. C2H6d. F2 

Solution: Which of the following gases has the lowest average speed at 25°C?a. H2Seb. PH3c. C2H6d. F2 

Problem

Which of the following gases has the lowest average speed at 25°C?

a. H2Se

b. PH3

c. C2H6

d. F


Solution

We’re being asked which gas has the lowest average speed at 25 ˚C.


Recall that the average speed of a gas is given by:



where R = gas constant, T = temperature, and M = molar mass of the gas.


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