[" A gas bulb of "1" litre capacity contains "2.0times10^(23)" molecules of nitrogen excrting a prou "],[7.57times10^(3)Nm^(-2)" .The root mean square velocity of the gas molecules is "],[[" 1) "757.7m/s," 2) "494.16m/s," 3) "936m/s," 4) "512m/s]]