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A known mixture of compounds A and B gave the following HPLC results: Compound Concentration (mg/mL) Peak Area (units) A 1.03 10.86 B 1.16 4.37 A solution was prepared by mixing 12.49 mg of B plus 10.00 mL of unknown containing just A and diluting to 25.00 mL. Peak areas of 5.97 and 6.38 were observed for A and B, respectively. Find the concentration of A (mg/mL) in the unknown.
suggest at least one characteristic absorption each in the ir spectra of 9-flurenone and 9-hydroxyfluorene that could
rhodium has a density of 12.45 gcm3. this metal crystallizes in a face-centered cubic unit cell. calculate the diameter
A chemist dissolves 543.mg of pure potassium hydroxide in enough water to make up 140.mL of solution. Calculate the pH of the solution?
a 80.0 ml volume of 0.25 m rm hbr is titrated with 0.50 m rm koh. calculate the rm ph after addition of 40.0 ml of rm
particulat reaction doubles between 273k and 283k , calculate the value of the activation energy for the reaction.
Benzene (C6H6) is converted to cyclohexane (C6H12) by direct addition of hydrogen gas H2. The plant produces 100 Ib-moles/hr of cyclohexane. 90% of benzene fed to the process reacts to form cyclohexane.
If there is no such evidence, then we have no reason to believe in witches. If there is evidence, we do have reason to believe in witches. There is no such evidence. Therefore we have no reasons to believe in witches.
A 25.0 mL sample of 0.723 M HClO4 is titrated with a 0.27 M KOH solution. What is the pH after the addition of 80.0 mL of KOH
If 101 g of CaO and 261 g of NH4Cl are mixed, what is the maximum possible yield of NH3?What mass of the excess reactant remains after the maximum amount of ammonia has been formed?
A supernatant from a saturated calcium hydroxide solution is titrated with a standardized hydrochloric acid solution to the methyl orange endpoint
Compare and contrast the similarities and differences between ionic and covalent bonding
a student was as ked to determine the molecular weight of a weak monoprotic dry acid hx. she was provided the following
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