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A: i
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An unknown compound reacts with ethyl chloride and aluminum trichloride to form a compound that has the following 1H NMR spectrum. What is the
structure of the compound?
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- 5) Richard Feynman called the Euler relation the most remarkable formula in mathematics. Use the Euler relation to give the value of the following quantities. eio=1 ein/2_ ein = ei2π = (Hix = (rcosx = i sin x)Calculate the linear momentum of a pickup truck that has a mass of 915 kg and is traveling eastward at 22 m/s. kg · m/sThe speed of an ion in a particle accelerator is doubled from 0.41c to 0.82c. The initial relativistic momentum of the ion is 5.08 x 10-17 kg m/s. Determine (a) the mass and (b) the magnitude of the final relativistic momentum of the ion. (a) Number i Units kg (b) Number i Units kg
- Q3)a) Discuss the any two applications of Beer’s law with suitable justification. (b) In an analytical laboratory a chemical compound namely Paracetamol (151.163 g/mol) is determined in a sample. A sample weighing 0.0295 g was dissolved in a solvent and diluted the solution to 1 L. The solution has λ max at 243 nm (ε=2.6×104 cm-1 mol-1 L). The solution exhibits an absorbance of 0.638 in a 2 cm cell. Calculate the percentage paracetamol in the sample. (c) Analyze any two causes of non-linearity of curve in the Beer’s law.3D16283.34693 16.3 mapbe -> 2. The volume of a cylinder is calculated as V= r?h where nr2 is the area of the circle. If a gallon of kerosene were spilled on a still lake and the height of the slick is, 1.386 nm, what would be the area in m? of the oil slick on the surface of the pond? 1 gal = 3.8 L; 1 nm = 1 x 10-9 m; 0.81 kg = 1 L; 1 kg = 2.206 Ibs; %3D %3D %3D %3D 1000 cm3 = 1.0 liter %3D 1.386nm |1X10-m Inm Aluminum has a density of 2.70 g/cm3. What would the volume be in in3 of a piece of alCalculate the answers using q = mCΔT
- 9. (a) What are the objectives of computational chemistry? Explain the differences intro between molecular mechanics and ab- initio methods.In a survey of 1000 large corporations, 250 said that, given a choice between a job candidate who smokes and an equally qualified nonsmoker, the nonsmoker would get the job (USA Today).(a) Let p represent the proportion of all corporations preferring a nonsmoking candidate. Find a point estimate for p.(b) Find a 0.95 confidence interval for p.(c) As a news writer, how would you report the survey results regarding the proportion of corporations that hire the equally qualified nonsmoker? What is the margin of error based on a 95% confidence interval?The potential energy associated with two charged particles is 34 mJ when they are separated by a distance d. What is the potential energy associated with them (in mJ) when they are separated by 3d?
- A volumetric calcium analysis on triplicate samples of the blood serum of a patient believed to be suffering from a hyperparathyroid condition produced the following data: mmol Ca/L = 3.55, 3.65, 3.14. What is the 95% confidence interval for the mean of the data, assuming(a) No prior information about the precision of the analysis?(b) s → σ = 0.056 mmol Ca/L?Given these two equations, calculate Cv for CO2 and N2 using the velocity of sound. 6. According to statistical mechanics, the contribution to Cy due to the ith vibrational mode of a molecule is c ee;/T Cv,vib,4 = R(7) ³ (e®,/T — 1)² › where Oi = hcv./kB, h is Planck's constant, and c is the speed of light in cm s-¹. v; is the vibrational frequency of the ith vibrational mode in wavenumbers (cm-¹). The quantity O, has dimensions of temperature and is sometimes referred to as the vibrational tem- perature (of the ith vibrational mode). The total vibrational contribution to the molar heat capacity for an N-atom (linear) molecule is then Cy,vib Cv,vib,i Calculate Cy for CO₂ at 300 K, assuming that the translational and rotational con- tributions are (3/2)R and R, respectively, and use the preceding equations to obtain the vibrational contribution. Four vibrational modes for CO₂ are expected (3N- 5). How- ever, three fundamental frequencies are observed at v= 667.3, 1340, and 2349.3 cm-¹.…Assuming that the percent of uncertainty in the calculated molar mass is the same as the percent of uncertainty in the temperature change, calculate the uncertainty in the molar mass. Could the chemist unequivocally state that the substance is cocaine? For example, is the uncertainty small enough to distinguish cocaine from codeine (C18H21NO3, molar mass = 299.36 g/mol)?