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A 10 mL sample of a solution of Pb(ClO3)2 was diluted with water to 21 mL. A 10 mL sample of the dilute solution was found to contain 0.021 moles of Pb2+. What was the concentration of Pb(ClO3)2 in the original undiluted solution?
The Ka of a monoprotic weak acid is 6.08 × 10-3. What is the percent ionization of a 0.187 M solution of this acid
Determine the amino acid sequence of a heptapeptide from the following data. Briefly explain the meaning of the results in each of the following treatments.
How many grams of Cl2 can be prepared from the reaction of 16 g of MnO2 and 30 g of HCl according to MnO2 + 4 HCl = MnCl2 + Cl2 + 2H2o
Consider 4.30 L of a gas at 365 mmH and 20 degrees C. If the container is compressed to 2.40 L and the temperature is increased to 39 degrees C, what is the new pressure, P2, inside the container
Calculate the densities of of each of the following gases in g/L at ATP: a) C3H8; b) NH3; c) Cl2; d) Ar.
A 2 mL sample was taken of a solution of barium iodate at 10 degree C. the sample was mixed with 2 mL of 0.5 M KI and 2 mL of 1M HCl. The transmittance of the mixture was read and compared to a calibration curve which indicated a concentration of ..
Sodium peroxide (Na2O2) reacts with water to form sodium hydroxide and oxygen gas. Write a balanced equation for this reaction and determine how much oxygen (in grams) is formed by the complete reaction of 35.23g of Na2O2.
When heated, the DNA double helix separates into two random-coil single strands. When cooled, the random coils form the double helix
A solution of H2SO4(aq) with a molal concentration of 3.22 m has a density of 1.183 g/mL. What is the molar concentration of this solution?
What is the molecular formula?
Calculate the concentration of magnesium and calcium in ppm. Record your answers as ppm Mg2+, and Ca2+ espectively. For each answer indicate the ppm as CaCO3 also.
A 24.9 mL volume of HCl reacts completely with 55.0 mL of aqueous Na2CO3. The reaction is as follows: 2HCl (aq)+ Na2CO3(aq) ->CO2(g)+H2O(l)+2NaCl(aq) The volume of CO2 formed is 141 mL at 27°C and 742 mmHg.
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