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Chemical Kinetics question:
If a reaction involving a single reactant is first order with a rate constant of 4.50×10-2 s-1, how much time is required for 75% of the initial quantity of the reactant to be used up?
The leaves of a Rhubarb contain high concentrations of diprotic oxalic acid (HOOCCOOH) and must be removed before the stems are used to make rhubarb pie. If pKa1=1.23 and pKa2=4.19, what is the pH of a .0282 M solution of oxalic acid
A 20.06g sample of mercury (Hg) reacts with chlorine to produce 23.61g of compound. What is the empirical formula of the compound formed. If the molecular mass is approximately 480 amu, what is the molecular formula
You wish to prepare 100 mL (total volume) of a buffer solution that is 0.025 M in carbonic acid, pH 7.25. You have solid H2CO3 and solid NaHCO3. Calculate how many grams of H2CO3 and HCO3- you need to weigh out to prepare this solution.
the recommended adult dose of elixophyllin a drug used to treat asthma is 6 mgkg of body mass. calculate the dose in
What osmotic pressure in atmospheres would you expect for a solution of 0.140M CaCl2 that is separated from pure water by a semipermeable membrane at 310 K?
Calculate the change in enthalpy, ? H, of the reaction (in kJ/mol) of water formed. Enter the appropriate sign (+/-). Enter to 1 decimal place.
At 700 K, the equilibrium constant, Kc, for the reaction H2 + I2 2 HI is 49.0. How many moles of H2 would have to be added to 1.00 mole of I2 in a 10.0-L flask to get a 90.0% yield
A 25.0-mL sample of a 0.090 M solution of aqueous trimethylamine is titrated with a 0.11 M solution of HCl. Calculate the pH of the solution after 10.0, 20.0, and 30.0 mL of acid have been added; pKb of (CH3)3N = 4.19 at 25*C
A L flask is filled with 1.35 g of argon at 25 C. A sample of ethane vapor is added to the same flask until the total pressure is 1.45 atm.
How many asymmetric carbon centers are present in the stilbene dibromide product? is the product Chiral? Explain.
Do synthesized 4-methylcyclohexane in an experiment. Get a good IR, very alike to the "real" one. Require interpreting the presence and absence of peaks. There is a small peak at 1350cm-1, larger peak at 1450cm-1, and small peak at 1650 cm-1, broa..
Explain how viroids and prions differ from viruses and give specific examples of diseases caused by these types of infectious agents.
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