Question

Oloms= 6.003110 holl= 60.031-19, 10 x 10.0233=342022 enci94 Mol - 3103 R 2. Determine the corresponding emission wavelength in nm) for the emission energies (in kJ/mol) of each Group IA or IIA metal given in the table below. Wavelength (mm) Element Emission Energy (kJ/mol 178.2 203.5 155.3 156.5 184.8 198.7 191.4 216.1 178.2 197.5 144.5 161.9

Answer 1

e Emission energy of element Li is on 178.2 kJ/mal Energy of one male phatan - Energy of one phatan fo. XNA . here NA = Avogadro number ist tart word NA = 6.0 22 x 10 23 malt ... Energy of one phaton. - Energy of one mole platan 3 1782 KJ/mol 6.022x1023 mal o mall = 296 x 10-22 1 KJ =10oo J D = 2096 X10-19 - 34 2 Hence, energy of one phatan = 2.96*10-19 5 Naw, Energy of One Phatan = hic non I here h = Planck's Constant (.6.626 X 10 TAF c= speed of light ( 3x108 m.st) - wariling th of that phatan Therefore whee. Terdam 1 Mh. ci je wito movedilen - 2 - - Energy of one phatan 6.626x10 -34 J. S x 3x108 m sa 2.96410-19 J 6.715 8 10 tm.

= 6-715 xlort m. A = 6.715 x 10-7 x 100 mm a = 671.5 nm his is the required walling th of the emission energy of the element liv Energy of one phatan = Emissian Energy (KJ/mal) 6.022 X 1028 mall 6.022 x 1023 in Jaul are can n = It will be in KJ mit (multiply it with 1000 to get it 1 KJ = 1000 J/= By applying this rela calculate energy of ane phatan in the unit of Jaule. Nawe, Energy of One phatan = he dhe Energy of ane phatan (Jaule) 6-626x10 -34 J. S x3x108 mot Energy of ane phatan En Jaule) Thus all can determine the wavelength in meter unit. to calculate the walllength in mm anit, are need to follow the followling relation Tam= 100 nm. Io get out the the wavelength in mm unit, are I to multiply the calculated wavelength in meter with logo Fallsuling the abauen determine the way the abzuementianed rules, all can the wavelength (um) and fill in the w blanks .

Emissian | Energy of plantan Energy Wallingth (mm) (kJ/mal) 178.2 2.96X10-19 671.55 203.5 588.11 3.38 X 10-19 2.58 x 10-19 2.60 X 10-19 155.3 156-5 770.46 7 64.54 184.8 198.7 191.4 216.1 3.078 10-19 3.300 10-19 3.188 10-19 3.59x10-19 647.49 602.36 625.og 553.70 671055 178.2 197.5 2096x10-19 3.28 x 10-19 606.04 Ba 144.5 16109 2.40810-19 2.69x10-19 828.25 738.96 6.626 X 10 -34 J. S x3x108 mot Energy of an phatan in J 1.9878 X 10 Jm. Energy of are phatan in J 14