Molecular formula, solutes

Propylene is a compound frequently polymerized to make polypropylene, which is used for rope, laundry bags, blankets, carpets, and textile fibers. Propylene has a moler mass of 42.08 g and contains 14.3% H and 85.7% C. What is its molecular formula SOLUTION... 

On being heated with a solution of sodium ethoxide in ethanol compound A (CyHisBr) yielded a mixture of two alkenes B and C each having the molecular formula C7H14 Catalytic hydrogenation of the major isomer B or the minor isomer C gave only 3 ethylpentane Suggest structures for compounds A B and C consistent with these observations... 

Solubilities are expressed as the number of grams of substance of stated molecular formula which when dissolved in 100 g of water make a saturated solution at the temperature stated (°C). 

Amongst products isolated from Heliotropium spathulatum (Boraginaceae) were 9 mg of a new alkaloid which gave a positive Ehrlich reaction with p-dimethylaminobenzaldehyde The molecular formula determined by mass spectrometry is CisH2sNOs. What is the structure of the alkaloid given the set of NMR results 54 Reference is useful in providing the solution to this problem. Conditions CDCI3, 9 mg per 0.3 ml, 25 °C, 400 MHz ( //), 100 MHz ( C). (a) HH COSY plot ... 

Lauryl alcohol is obtained from the coconut and is an ingredient in many hair shampoos. Its empirical formula is C H. A solution of 5.00 g of lauryl alcohol in 100.0 g of benzene boils at 80.78°C Using Table 10.2, find the molecular formula of lauryl alcohol... 

In dilute acidic solution, sucrose (Ci2H22Ou) decomposes to glucose and fructose, both with molecular formula C6Hi2Ofi. The following data are obtained for the decomposition of sucrose. 

Aspirin, a commonly used pain reliever, is a weak organic acid whose molecular formula maybe written as HC9H7O4. An aqueous solution of aspirin has total volume 350.0 mL and contains 1.26 g of aspirin. The pH of the solution is found to be 2.60. Calculate Kb for aspirin. 

P, with the remainder oxygen. The mass spectrum of compound B yields a molar mass of 97.99 g-mol. Write the molecular formula of compound B. (c) Compound B reacts with an aqueous solution of calcium hydroxide to form compound C, a white precipitate. Write balanced chemical equations for the reactions in parts (a), (b), and (c). 

Suppose that 10.0 g of an organic compound used as a component of mothballs is dissolved in 80.0 g of benzene. The freezing point of the solution is 1.20°C. (a) What is an approximate molar mass of the organic compound (b) An elemental analysis of that substance indicated that the empirical formula is C3H2C1. What is its molecular formula (c) Using the atomic molar masses from the periodic table, calculate a more accurate molar mass of the compound. 

Molecular formula Molecular weight Stability in alkaline solution... 

Cyfluthrin-met/ty/-fi(6 (provided in acetonitrile solution by Bayer Corp.) Cyfluthrin stable-isotope internal standard (IS), Cyclopropanecarboxylic acid, 3-(2,2-dichloroethenyl)-2,2-dimethyl-, cyano(4-fluoro-3-Phenoxyphenyl)methyl ester-met/tyWe, molecular formula C22H12D6CI2FNO3, molar mass 440.3, ion observed at 213.0 (GC/MS)... 

Hufford et al [57] used proton and 13C NMR spectrometric data to establish the novel sulfur-containing microbial metabolite of primaquine. Microbial metabolic studies of primaquine using Streptomyces roseochromogenus produced an A-acety-lated metabolite and a methylene-linked dimeric product, both of which have been previously reported, and a novel sulfur-containing microbial metabolite. The structure of the metabolite as an S-linked dimer was proposed on the basis of spectral and chemical data. The molecular formula C34H44N604S was established from field-desorption mass spectroscopy and analytical data. The 1H- and 13C NMR spectra data established that the novel metabolite was a symmetrical substituted dimer of primaquine A-acetate with a sulfur atom linking the two units at carbon 5. The metabolite is a mixture of stereoisomers, which can equilibrate in solution. This observation was confirmed by microbial synthesis of the metabolite from optically active primaquine. 

We determine the molality of the solution, then the number of moles of solute present, and then the molar mass of the solute. Then we determine the compound s empirical formula, and combine this with the molar mass to determine the molecular formula. 

As the story goes, a wine production batch gone bad provided fairly large amounts of a new organic compound, the study of which was deemed of practical importance for the French wine industry. The new material had the same molecular formula as tartaric acid, which to some experts of the time meant it had to be the same as tartaric acid. Solutions of salts of the new material, however, did not rotate the plane of polarization of plane-polarized light, as solutions of salts of tartaric acid were known to do. The new material was named para tartaric acid, or racemic acid (the name racemic acid being derived from the Latin racemus bunch of grapes). 

UV absorption maxima occur at 236, 274 and 316 nm. The molecular formula of zearalenone is C18H22Os, its molecular weight is 318.4 g/mol and its melting point is 162-163°C (Blackwell et al. 1985 Josephs et al. 2003). The maximum fluorescence in ethanol occurs with irradiation at 314 nm and with emission at 450 nm. Its solubility in water is about 0.002 g/100 ml. In an aqueous solution of inositol, the presence of zearalenone can change the crystal structure of this alcohol, which indicates the possibility of interaction between both substances (our observations). Moreover, zearalenone is slightly soluble in hexane and progressively more so in benzene, acetonitrile, methylene chloride, methanol, ethanol and acetone. However, it is readily soluble in aqueous alkali. 

Calandria evaporator, in sodium chloride solution mining, 22 804 Calcicard, molecular formula and structure, 5 97t, 118t Calciferols, 25 791-793 dietary sources of, 25 793 Calcination, 2 353, 403, 407—410 12 726-727... 

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