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Problem- A 3.96 x 10-4 M solution of compound A exhibited an absorbance of 0.624 at 238nm in a 1.00 cm cuvet; a blank solution containing only solvent has an absorbance of 0.029 at the same wavelength. A unknown solution of compound A in the same solvent was diluted from an initial volume of 2.00mL to 25.00mL and had an absorbance of 0.733 at 238 nm in a 1.00 cm cuvet. What is the concentration of the unknown solution?
Explain the each step. Explain the process and each step.
Carbon and silicon belong to the same group and are known to have similar properties. Do you think that silicon can replace the role that carbon plays
When the chain-growth polymerization is conducted in dilute and more concentrated solutions the resulting degrees of polymerization/molecular weights obtained are observed to be very different,
The student uses poor lab practice by writing down the mass of his unknown sample on a piece of paper towel and then copies down the value incorrectly onto his data page. The actual mass of the sample was 0.2145g. He mistakenly wrote down 0.1245g,..
Presuming equal concentrations and complete dissociation rank these aqueous solutions by their freezing point from highest to lowest.
How many hours will it take to produce 61.0 kg of Al metal by the reduction of Al3+ in an electrolytic cell using a current of 484 amps?
A student prepares a weak acid solution by dissolving 0.2500 g HZ to give 100. mL solution. The titration requires 30.0 mL of 0.1025 M NaOH
Assume you dissolve 0.235 g of the weak acid benzoic acid, C6H5CO2H, in enough water to make 9.00 multiplied by 102 mL of solution and then titrate the solution with 0.148 M NaOH. C6H5CO2H(aq) + OH-(aq) = C6H5CO2-(aq) + H2O(l)
What is a specific example that exists foreach: biochemical, pharmaceutical and diagnostic chemical reactions in healthcare and why might it be of importance to healthcare professionals?
The density of 70.5 weight% aqueous perchloric acid is 1.67 g/ml. Recall that grams refers to grams of solution (=g HClO4+g H2O). How many grams of HCIO4 are in 1 Liter
If a solution of KBr (MM=119.01 g/mol) has a concentration of 2.5 M and a solution density of 1.05 g/ml what is the mass % of the KBr solution
a 3.00 l helium balloon initially at stp floats up to an altitude of 10 km where the pressure is 200.0 torr and the
What is the molar solubility of silver Chromate in a solution of 0.20 M silver nitrate? Ksp for silver Chromate is 1.1 x 10^-12.
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