Chapter 26.4, Problem 14ATS

State the name and condensed formula of isooxazole obtained by reacting acetylacetone and hydroxylamine.

State the name and condensed formula of the isothiazole obtained by reacting acetylacetone and thiosemicarbazide.

Provide the semi-developed formula of isooxazole obtained by reacting acetylacetone and hydroxylamine.

Given a 1,3-dicarbonyl compound (R1-CO-CH2-CO-R2), indicate the formula of the compound obtaineda) if I add hydroxylamine (NH2OH) to give an isooxazole.b) if I add thiosemicarbazide (NH2-CO-NH-NH2) to give an isothiazole.

An orange laser has a wavelength of 610 nm. What is the energy of this light?

The molar absorptivity of a protein in water at 280 nm can be estimated within ~5-10% from its content of the amino acids tyrosine and tryptophan and from the number of disulfide linkages (R-S-S-R) between cysteine residues:   Ε280 nm (M-1 cm-1) ≈ 5500 nTrp + 1490 nTyr + 125 nS-S   where nTrp is the number of tryptophans, nTyr is the number of tyrosines, and nS-S is the number of disulfide linkages. The protein human serum transferrin has 678 amino acids including 8 tryptophans, 26 tyrosines, and 19 disulfide linkages. The molecular mass of the most dominant for is 79550.   Predict the molar absorptivity of transferrin. Predict the absorbance of a solution that’s 1.000 g/L transferrin in a 1.000-cm-pathlength cuvet. Estimate the g/L of a transferrin solution with an absorbance of 1.50 at 280 nm.

In GC, what order will the following molecules elute from the column? CH3OCH3, CH3CH2OH, C3H8, C4H10

Beer’s Law is A = εbc, where A is absorbance, ε is the molar absorptivity (which is specific to the compound and wavelength in the measurement), and c is concentration. The absorbance of a 2.31 × 10-5 M solution of a compound is 0.822 at a wavelength of 266 nm in a 1.00-cm cell. Calculate the molar absorptivity at 266 nm.

How to calculate % of unknown solution using line of best fit y=0.1227x + 0.0292 (y=2.244)