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CHEMMIp9 - 21 An in excited hydrogen atom emits light with...

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Unformatted text preview: 21. An in excited hydrogen atom emits light with a frequency of 1.14 x 10“ Hz to reach the energy level for which n H 4. In what principle quantum level did the electron begin? {leptl SW5]: .'- so = h 'u = {-5.63 :r. 10'“ J - s] [1.14 x 1D“ s'1} = 7.56 x 10'2" J {2151;}: Since light is emitted flE = — 5.56 x lquJ {ZPtj USE BGHR EQU. FOR H—hTGM {ANY le— H—LIKE ATDM, Li“ J: z! E“ = —2.1Tfl x 10 'm J t E? 1 for n = 1, 2, ,,_ m WHEREIr J: JDULES Z: hTflMIC NO. n: ENERGY LEVEL Sc AE = E. — El1 {because light is emitted] 1’ 1i -1& a u 1.55 x 104‘ J = —2.1TS x 10 J {31 — E? } :4pt} — $.56 31'. Lo'm J 12 1" —2.133 x 10”“ J ' [ET ' ET 3 l2Pt} _ 1 1 3.d7 x 102 = T? — a: i2pt} l ' 4 F? = 2.?8 x In n h 6 fi2pt} 22. A solution is prepared by dissolving 55.1 g of Kcl in approximately 15 mL of water and then adding water to a final volume of 125 mL. What is the molarity of KCliaq} in this solution? [opt] molar mass of KCl = 39.10 + 35.45 = ?4.55 g.|:nu;:-l'1 [lpt] no of moles = 55.1f?4.55 = ?.39 x ltil'1 mol [1th molarity . molestol - ?.39 3 1o1 molleS x 104 L [lpt] molerity = 5.91 TI1-ol.L'1 [lpt] {—1pt for incorrect unite and -lpt for incorrect sf} ...
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