Question

Calculate the mean speed, using equation 1.13 and 1.17 of (a) He atoms and (b) CH4 molecules at (i) 79 K, (ii) 315K, and (iii) 1500K.

Vrms= (2(Ek)/m)^1/2
Vrms= (3RT/M)^1/2

M(He)= 4.0*10^-3 kg/mol
M(CH4)= 16.0*10^-3 kg/mol
And your problem is? Just plug in the numbers.

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