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Naturally occurring cobalt consists of only one isotope, ^59Co, whose relative atomic mass is 58.9332. A synthetic radioactive isotope of cobalt, ^60Co, relative atomic mass 59.9338, is used in radiation therapy for cancer. A 1.7801 g sample of cobalt has an apparent "atomic mass" of 58.9901. Find the mass of ^60Co in this example.
Decane has 4.5 min retention time on HP-1 column (25 m length, 0.25 mm I.D., 0.33 mkm film thickness) at 120C. Calculate the capacity factor for decane on HP-1 column (25 m length, 0.25 mm I.D., 0.5 mkm film thickness) at 120C. Explain.
A 100.0 mL sample of .20 M HF is titrated with .10 M KOH. Determine the pH of the solution after the addition of 100.0 mL of KOH. The Ka of HF is 3.5*10^-4
draw the molecule by placing atoms on the grid and connecting them with bonds. include all lone pairs of electrons and
What is the mole fraction of acetone, C3H6O, in the vapor phase from a solution consisting of a mixture of acetone and ethyl acetate, CH3COOCH2CH3, at 30.00 °C, if the total pressure above the solution is 184.6 torr?
What is the initial concentration (in M) when 19 mL of a iron(III) chloride solution was diluted with 18.5 mL of solvent to a final concentration of 0.576 M? Assume the volumes are additive.
Sulfamic acid is a primary standard that can be used to standardize NaOH. What is the molarity of a sodium hydroxide solution
Determine what concentration of OH - is needed to dissolve 0.015 mol of Zn(OH) 2 zinc hydroxide in a liter of solution
NH3 solution is titrated by HCl solution, what is the pH at the 3/4 point of the titration? Kb(NH3)=1.8*10^-5
What's the mass of sodium oxide produced if 1.5 g of sodium reacts with excess gaseous oxygen. Write the balanced equation.
For CH2CBr2, which geometric isomers do you suppose is energetically most stable; containing less repulsion energy: cis or trans
If the initial pressure of NH3(g) is 1.766 atm, calculate the % of NH3(g) left over after the reaction reaches equilibrium according to the balanced equation. The value of Kp at 600.0 °C is 455000.00. The initial pressure of the reaction products ..
How many moles of solid sodium fluoride should be added to 5.0 L of a saturated solution of barium fluoride, BaF2 , at 25 degrees Celsius to raise the fluoride concentration to 0.025 mol/L
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