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A certain first-order reaction (A?products) has a rate constant of 8.10×10-3s-1 at 45°C. How many minutes does it take for the concentration of the reactant,[A], to drop to 6.25% of the original concentration
If 1.0 μg/ml of pigment X shows an absorbance of 0.059 at 370 nm, then what is the concentration of a solution of pigment X that shows an absorbance of 0.443 at 370 nm? (Assume linearity.)
Question- How long would it take to deposit 1.36g of copper (Cu) from an aqueous solution of Cu(II) sulfate by passing a current of two amperes through the solution. Atomic mass of Cu is 63.546.
The daily dose of ampicillin for the treatment of an ear infection is 115 mg/kg of body weight. What is the daily dose for a 34-lb child?
Find the formula of a compound using stoichiometry and ideal gas equation and Deduce from these data the corresponding equation and write formulas for the oxide and sulfate of M .
Explain what is meant by the discontinuous emission spectra of atoms (seen in flame tests or gas discharge tubes) and how the Bohr (Planetary) and Schrodinger (Quantum-Mechanical) model for electron structure explains these discontinuous spectra
How many donor atoms enable EDTA to form a stable complex ion with lead. A. 4 B. 6 C. 5 D. 3 E. 2
In a preparation of 2-butanone 2,4-dinitrophenylhydrazone, calculate the amount of reagent to be weighed out from a bottle of (70% 2,4-DNP/30% H2O) if it is reacted with 4.14g of 2-butanone and a 1.4 molar excess of the 2,4-DNP is required.
What is the molecular, complete ionic equation, and net ionic reaction for the following. I get stuck trying to figure out the solubility. NaOH + HC2H3O2 -> BaCO3 + HNO3 -> K2S + HCl ->
Show how many µL of protein sample you will take and add with the desired volume of DTT and Laemmli buffer to make the right concentration of sample.
What mass (in grams) of NaCl would you need to add to 100.00 mL of solution to make a final concentration of 100.00mM NaCl?
A 5 kg aluminum block sits in your lab, which is at 21 C. You wish to increase the temperature of the block to 50 C. How much heat in [J] must be supplied
During a photochemical smog episode in a coastal city, the steady-state concentration of oxygen radicals at ground level was measured to be 0.09 ppmv at 25 degrees celsius.
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