The rms speed of a certain sample of carbon dioxide molecules, with a molecular weight of
44 g/mole, is 396 m/s. what is the rms speed of water molecules, with a molecular weight of
18 g/mol, at the same temperature?

The root mean square speed of a object is given as

Where,

= Molar mass

T = Temperature

R = Universal gas constant

Tenemos que ambos estados tienen la misma temperatura tenemos que para el estado 1 y 2 la ecuación en función de ésta es

Therefore the rms speed of water molecules is 619.134m/s

the average speed is 24.57 km/hr

conservation of mass

mass before something happens = mass afterwards