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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.
How many grams of a compound "x" would be extracted by one 40.0 mL portion of ether from a solution of 40.0 mL of water containing 1.0 grams of compound "x"? The solubility of a compound "x" is 10.0/100 mL of ether and 5.0/100 mL of water.
a a sample of solid caoh2 is stirred in waterat 30 degree c until the solution contains as much dissolvedcaoh2 as it
Here are the effective nuclear charges, Zeff, for the valence electrons of four different atoms. 1.30, 1.95, 2.60, 3.25 In order, these values could belong to what list of elements
An unknown solid mixture containing benzoic acid,copper(II)sulfate and sand. She added 15mL.of acetone to her sample. Which component of the mixture dissolved in the acetone?
Given the acid is diprotic and its pKa is 1.90 and 6.70, estimate the PH after 10 mL of base are added? After 20 mL basea added? After 30 mL Base added?
evaporated the water from NaOH extracts prior to adding acid?
Use the dipole moments of HF and HCl ( HCl= 1.08 D, HF= 1.82 D) together with the percent ionic character of each bond (HCl 20% ionic, HCl 45% ionic) to estimate the bond length in each molecule.
Make one liter of a 0.01 M sodium acetate buffer at pH 4.53.pka of acetic acid is 4.76. Explain how to calculate the amounts needed when not given the accurate amount of products
HBr is an acid. Please write a chemical equation showing how it is an acid according to the Arrhenius definition. The response has to be in the form of a balanced chemical equation with all phases included.
If an enhancer is placed on one plasmid as well as its corresponding promoter is placed on a second plasmid that is catenated (linked) with the first initiation is almost as efficient as when the enhancers as well as promoter are on the same plasm..
Platinum crystallizes in a face-centered cubic lattice (the Pt atoms are at the lattice points only). If the density of the metal is 22.3 g/cm3, what is the unit cell edge length in pm
Which of these ions best represents the conjugate acid in a "phosphate" buffer at physiological pH? Explain. H2PO4^-, HPO4^2-, PO4^3-
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