Kinetic Molecular Theory

AP Chemistry· difficulty 2/5

Two gases are at the same temperature.

Why is the He distribution shifted to higher speeds?

A
$Lower molar mass means higher average speed at same T$
check_circle
B
$He has stronger IMFs$
C
$He molecules are larger$
D
$He has greater kinetic energy than Xe$

Explanation

At the same T, average KE is the same; v_rms = sqrt(3RT/M). Smaller M (He = 4 g/mol) gives larger v_rms than Xe (131 g/mol).

Want 10 more like this — adaptive to your weak spots?

Practice 10 like thisarrow_forward Predict my AP score

Related questions

chem-prop-018
Average kinetic energy of gas particles depends on…
chevron_right
chem-prop-020
As temperature increases, the Maxwell-Boltzmann distribution…
chevron_right
chem-prop-053
Helium effuses how many times faster than CH4 through a small hole at the same temperature?…
chevron_right

auto_awesomeAll Tools question_answerHomework Q&A menu_bookAP & SAT Prep timelineLearn Mode