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How many unpaired electrons are found in the ground state electron configuration of selenium (Se)?
Explain what are the concentrations of acetic acid as well as acetate ion in 0.20M acetate buffer, pH 4.90. The pKa of acetate is 4.76.
a 2.2 g sample of an unknown acid with an empirical formula of c3h4o3 is dissolved in 1 l of water. it requires a 25 ml
Calculate the pressure and composition of air 100 miles above the surface of the earth assuming that the atmosphere has a temperature of 0 celsius independent of altitude. The correct answer is 3.27 X 10^-9 bar; yO2=0.015, yN2=0.985 but I don't kn..
Problem- A reaction evolves 250 kj of heat but has a decrease in order of 800 k/j. Calculate delta G for this reaction at 27 degrees Celsius.
An ancient club is found that contains 170 g of pure carbon and has an activity of 7.5 decays per second. Determine its age assuming that in living trees the ratio of14C/12C atoms is about 1.30 × 10-12.
a 100.0 solution containing aqueous hcl and hbr was titrated with 0.1300 m naoh. the volume of base required to
how many grams of sodium benzoate should be added to prepare the buffer?
Depict and label a flowchart of the process, and show via DOF analysis that you can solve for all the unknowns.
A 1.500-g sample of a mixture containing only Cu2O and CuO was treated with hydrogen gas to produce 1.276 g pure copper metal. Calculate the percent composition by mass of the mixture.
Determine the molar mass of the nonelectrolyte if the osmotic pressure of the solution = 23.6 atm, also express your answerin g/mol?
Glucose is much more soluble in water than 1-hexanol even though both have 6 carbons. Explain
considering the given chemical reaction as nh3g cl2g rarr nh2clg hclg compute the deltah for this reaction and
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