Appendix

Appendix 11th Std Chemistry 11th Std Chemistry - - - - Fundamental constants Avogadro number N . × Atomic mass unit (or) Unified atomic mass amu (or) u . × - kg Speed of light c . × m s - Elementary charge (or) Charge of an electron e . × - C Planck’s constant h . × - Js Mass of electron m e . × - kg Mass of proton m p . × - kg Mass of neutron m n . × - kg Bohr’s radius a . Å Rydberg constant R ∞ . × cm - Universal gas constant R . J K - mol - . L atm K - mol - . cal K - mol - . L mmHg K - mol - . L mbar K - mol - Commonly used SI Prefixes femto pico nano micro milli centi deci kilo mega giga f p μ m c d k M G - - - - - - - 11th Std Chemistry 11th Std Chemistry - - - - Inter - Conversion of Units Å - m atm = . kPa .01325 x N m - atm = .01325 x J m - = Torr (mmHg) eV .60219 x - J N J m - dyne J erg Kg m s - cal . J Critical constants of selected gases Gas Critical Pressure, P c (atm) Critical Volume, V c (cm mol - ) Critical Temperature, T c (K) He . . . Ne . . . Ar . . . Kr . . . Xe . . . H . . . N . . . O . . . Cl . . Br HCl