Calculating a Root-Mean-Square Speed
Calculate the rms speed of the molecules in a sample of N2 gas at 25 °C.
Fill in the blanks for the following statement: The rms speed of the molecules in a sample of H2 gas at 300 K will be ____ times larger than the rms speed of O2 molecules at the same temperature, and the ratio urms(H2)/urms(O2) _____ with increasing temperature. (a) four, will not change, (b) four, will increase, (c) sixteen, will not change, (d) sixteen, will decrease (e) Not enough information is given to answer this question.
Chapter 7.3 Intermolecular Forces: attractive forces between neighboring molecules -> London Dispersion, Dipole-Dipole, Hydrogen Bonding, and Ion-Dipole Van der Waals: attractive forces that act between atoms of molecules in a pure substance -> London Dispersion, Dipole-Dipole, Hydrogen Bonding London Dispersion Forces: coulombic attractions between instantaneous dipoles of molecules that is present in all molecules. larger molecule -> more polarizable -> stronger london dispersion force stronger force -> more attached -> higher boiling point
