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How many grams of cobalt metal can be formed if a 2.00 amp current is passed through a solution of Co2+ for a period of 20.0 minutes?
what is the ksp value of potassium hydrogen tartrate at 10 degree celsius oc 22oc 35oc and 50oc? what is the enthalpy
Teeth are made principally from the mineral hydroxyapatite, Ca5 (PO4)3OH, which can be dissolved in acidic solution such as that produced by bacteria in the mouth
when the zinc coating on an iron can is scratched, rust does not form. use the activity series to explain why this happens.
Consider a saturated solution of Zinc arsenate, Zn3(AsO4)2, in which the following reactions can occur: Zn3(AsO4)s (s) --> 3Zn+2 + 2AsO4 -3 Ksp=1.0e-27 AsO4 -3 + H2O ---> HAsO4 -2 + OH- Kb1=3
Calculate the percentage composition by mass of each of the elements in sulfuric acid. Report each of your answers to 4 significant figures
what is the frequency of the photons emitted by hydrogen atoms when they undergo transistions from n=5 to n=3
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
A gaseous mixture containing 0.150 mol fraction of carbon tetrachloride (CCl4) and 0.850 mol fraction of dry air is initially at 65.0°C and 1121 mmHg
Dry ice, CO2 (s), has a melting temperature of -78o C and will not form a liquid unless atmospheric pressure exceeds 5.1 atm. The following reaction is conducted at -90o C and 101.325 kPa: CO2 (g) ? CO2 (s)
a flask contains 22.5 g of an unknown liquid initially at 14.0oc. after 2.34 kj of heat are added to the liquid its
Calculate the osmotic pressure associated with 50.0 g of an enzyme of molecular weight 98,000 g/mole dissolved in 2600 mL in of benzene at 30.0 degree celcius
a sample of methane of mass 4.5 g (4.5g(1mol/16.04g)=.2804mol) occupies 12.7 L at 310K. a) Calculate work done when the gas expands isothermally (delta T=0) against a constant external.
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