5. a) How many vibrational normal modes does HCN have? b) How many peaks (not counting the fine structure of each peak) would you expect to see in the IR spectrum of gas phase HCN?
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- 1. (a) What factors determine the relative intensity of transitions in a pure rotational absorption spectrum? When will a maximum intensity be observed?What is the frequency of green light that has a wavelength of 531 nm? (c = 3.00 x 10⁸ m/s)What is the wavelength of a 6.76 x 1012 /s wave? Sorry im just really stuck on this question, Please dont leave any minor detail in the question, And also may u step by step this equation.
- 20 4. A sample containing ethanol and water was found to have n6 = 1.3400. Calculate the exact percentage of ethanol and water in this example. Show your work. (Hint: Solve this mathematically. Assume a linear relationship between concentration and refractive index. You can make the y-intercept the refractive index of water, and use the slope formula to find the slope. The x axis (concentration) will be from 0% ethanol to 100% ethanol. From this information, you can get the equation of the line, then plug in your numbers from there.)The magnesium electron spectrum has a line at 266.8 nm. Does it have a greater speed in a vacuum (an area without an atom or particle) than does red light with a wavelength of 652 nm? Why or why not?After performing an FTIR analysis on CO, you plot transition frequency (cm¯1) vs. m and fit your data to a polynomial equation. The equation you obtain is y = -0.027x2 + 4.0x + 2143. Based on these results, what is the value of the fundamental vibrational frequency? cm 1
- (b) The first photoelectron band system of O2 (i.e. ionisation to the ground electronic state of O2) shows a limited vibrational progression, peaking at v = 1. The second photoelectron band system (i.e. ionisation to the first excited electronic state of O2) shows an extensive vibrational progression peaking at v= 8. What do these facts indicate about the nature of the two highest- occupied valence molecular orbitals of O2?(a) A blackish brown solid ‘A’ when forced with alkali metal hydroxide in presence of air, produces a dark green coloured compound ‘B’, which on electrolytic oxidation in alkaline medium gives a dark purple coloured compound ‘C’. Identify A, B, C and write the reactions involved. What happens when an acid solution of green coloured compound (B) is allowed to stand for some time. (b) (i) Calculate the spin magnetic moment of M2+(aq) ion. Atomic number (Z) = 27. (ii) Chromium is typical hard metal while mercury in liquid, explain.Below is a Beer's Law Plot for the concentration of a specific colored compound x. A solution of compound X is measured with the spectrophotometer to have an optical density of 0.60. a) What is the concentration of compound X in this solution. Answers must contain proper units for full credit. b) The absorbance of this compound was measured at 540 nm. Why was this absorbance chosen? 0.9 0.8 0.7 0.6 805 4 0.4 0.3 0.2 Absorbance at 540 m
- A drug has a measured diffusivity of 5*10^-6 cm^2/s^-1 at 37 degree Celsius. What is this drug’s Stokes-Einstein radius in nm?The atomic emission spectrum for a particular element includes blue-violet light with wavelength 440. nm. Calculate the energy in joules of this light given that E = h c/A, and h = 6.63 x 10-34Js, and c = 3.00 x 10°m/s. (h andc are constants, A is wavelength, convert nm into m) h c E =Guanosine (C10H13N5O5) in solution has a maximum absorbance at a wavelength of 275 nm. The molar extinction co-efficient at this wavelength is 84M−1cm−1and the path length is 24.7 cm. Through the use of a spectrophotometer, it is found that the that A275= 1.48. What is the concentration of the guanosine solution in grams/litre? Molecular weights (g/mol): C-12, H-1, N-14, O-16 Select one: A. 0.201869 g/L B. 0.435188 g/L C. 0.059919 g/L D. 0.294046 g/L E. 0.000713 g/L