The temperature of the diatomic hydrogen gas sample is increased to 100∘c. the root-mean-square speed vrms for diatomic hydrogen at 100∘c is:

In physical chemistry, there is an equation for the root mean square speed, or also known in abbreviated form of rms. The equation is:

rms = √ (3RT/M)

where

R = 8.314 J/mol-K

T is the absolute temp

M is the molar mass; For H₂, M = 0.002 kg/mol

rms = √ (3 (8.314) (100+273) / (2))

rms = 2,156.78 m/s