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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 spectrums between 7.2 and 7.0 there is a complicated pattern that integrates to four protons. Furthermore there are triplets at 3.0 and 2.7, each integrating to 2 protons. Recognize the structure of the unknown
Molar Concentration of Copper (II) Nitrate, A 25.00 mL sample containing Cu2+ gave an instrument signal of 23.6 units (corrected for a blank). When exactly 0.500 mL of 0.0287 M Cu(NO3)2 was added to this solution
Calculate Delta Hrxn for the following reaction- Fe2O3 (s) + 3CO (g)-----> 2Fe (s) + 3CO2 (g). Use the following reactions and given delta H's. 2Fe (s) + 3/2O2 (g)----->Fe2O3 (s), Delta H= -824.2 kJ CO (g) + 1/2O2 (g)----->CO2 (g), Delta H=-282.7 ..
Assuming that the loss of ability to recall Chem 401 material is a first-order process with a half-life of 55 days for the traditional (talking head lecture) and a C of 305 days for the active approach,
There are two reason why the enols of beta-dicarbonyl compounds, such as pentane-2,4-dione are relatively stable. One is that they are conjugated and the pi-electron overlap due to the conjugation provides additional stability.
Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. A solution containing 3.30 g of sodium carbonate is mixed with one containing 4.71 of silver nitrate.
Para-amino benzoic acid, PABA, HC7H6NO2 is used in some sunscreen agents. A solution is made by dissolving .263 mol of PABA in enough water to make 750mL of solution. The solution has [H+]=2.6E-3 M. Explain what is the Ka for PABA
To provide energy for the human, the O2 is reduced to H2O duing food oxidation by the following reaction: Recall that 1 ampere is equal to a charge of 1 coulomb per second flowing past a point in a circuit.
If a chemical reaction occurs at a rate of 2.25 * 10-2 moles per liter per second at 322 K, what is the rate expressed in moles per liter per minute?
If the following elements were involved in redox reactions, which noble-gas configuration would they most likely attain?LI,Na,O,P,Sc,As,Sr--- He,Ne,Ar,Kr matching
Describe and explain the possible effect on your results of the following experimental errors or variations. a) you added only enough 3 M H2SO4 to bring the pH down to 4.
A 0.307 g sample of an unknown triprotic acid is titrated to the third equivalence point using 35.2mL of 0.106 M NaOH. Compute the molar mass of the acid.
For the compound MX, Ksp is 2.00 × 10-11. The anion X- forms the weak acid HX (Ka = 1.8 × 10-5). Calculate the solubility of MX in 10.00 M strong acid
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