Find number of molecules in 1 cm^3 of ox...

Find number of molecules in `1 cm^3` of oxygen at N.T.P., if mass of oxygen molecules is `5.28xx10^-28kg` and R.M.S. velocity of oxygen molecules at N.T.P. is `426m//s`. (Take pressure at N.T.P.=`10^5 N//m^2`)

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