Calculate (i) rms velocity and (ii) mean kinetic energy of one gram molecule of hydrogen at STP. Given density of hydrogen at STP is `0.09 kg m^(-3)`.

Explanation

`P=(1)/(3)rho(V_(rms))^(2)therefore v_(rms)=sqrt((3P)/(rho))`
Here `P=76cm` of Hg `=1.013xx10^(5)Nm^(-2)`
`rho=0.09 kg m^(-3) , v_(rms)=sqrt(((3)(1.013xx10^(5)))/(0.09))`
`v_(rms)=1.84xx10^(3)ms^(-1)`