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A molecule of unknown structure has a molecular formula of C9H8O2. In the infrared spectrum there are absorptions at 1761, 1145, and 761 cm-1. In the 13C NMR spectrum, there are absorptions at ? 168.4, 152.0, 128.2, 128.0, 124.3, 122.8, 116.8, 29.1 and 23.6. In the 1H NMR spectrum, between ? 7.2 and 7.0, there is a complicated pattern that integrates to 4 protons. Additionally, there are triplets at ? 3.0 and 2.7, each integrating to 2 protons. Identify the structure of the unknown.
48.61g od maagnesium was dissolved in diluted sulfuric acid and 490g of MgSO4. 7H2O was isolated from the solution. How many percent of impurities did the metal contain?
what change in the number of moles of Ag occurs in the system? (2)what change in the concentration of Ag occurs in the system?
What are the concentrations of HSO4-, SO42-, and H+ in a 0.255 M KHSO4 solution? (Hint: H2SO4 is a strong acid; Ka for HSO4- = 1.3 10-2.)
A 391-rm mL sample of unknown rm HCl solution reacts completely with rm Na_2CO_3 to form 20.1 g rm CO_2. What was the concentration of the rm HCl solution?
Compute the band gap for this semiconductor material after Consideing an intrinsic semiconductor with a conductivity σ that triples between the temperature 27 degree Celsius and 57 degree celsius.
The half-life of C-14 is 5730 years. A fossil was analyzed and determined to have a carbon-14 level that is 50.0 % that of living organisms. How old is the fossil?
A sample of nitrosyl bromide (NOBr) decomposes according to the equation 2NOBr(g)-->2NO9g) +Br2 An equilibrium mixture in a 5.00- vessel at 100 degrees celsius contains
Compute the moment of inertia of the molecule in kg m 2 . And also determine the greatest wavelength of the radiation that can excite the molecule into rotation.
Show that the balanced equation obeys the law of conservation of mass.
An impure sample of potassium hydrogen phthalate, KHP, having a mass of 111.07 g was dissolved in water. This acid sample was neutralized by the addition of 310.0 mL of 0.250 M NaOH
replacement compounds for the Freons have gone into production: HFC-134a (chemical formula: CH 2 FCF 3 ) and HCFC-124 (formula:CHClFCF 3 ) In 1991. Determine the molar masses of these two compounds
What is the structure (including functional groups)? Stereochemistry (racemic or single enantiomer)?
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