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A freshly prepared sample of curium-243 undergoes 3312 disintegrations per second. After 6.00 years, the activity of the sample declines to 2755 disintegrations per second. Calculate the half-life of curium-243. half-life = ______________ yrs
A titration is performed in which 50.0 mL of 0.0463 M acetic acid (Ka = 1.8 x10^- 5) is titrated with 0.1000 M NaOH. Calculate the pH at the beginning of the titration (Vb = 0).
The functional differences and differences in 3-D structures between 2 different enzymes from e. coli result directly from their different:
4 HCl(aq) + MnO2(s)-> MnCl2(aq) + 2 H2O(g) + Cl2(g) Consider the reaction of 1.53 mol HCl with excess MnO2. How many moles of Cl2 form?
What volume of hydrogen can be produced at 22.0C and 1.01atm pressure by the reaction of 25.0ml of 2M HCL with 0.3g Zn?
calculate the volume in L occupied by 0.345moles of a sample of h2(g) at a pressure of 3.90 atm and a temperature of -163C.
Calculate the hydrogen-ion concentration [H+] for the aqueous solution in which [OH-] is 1 x 10-11 mol/L. Is this solution acididc, basic, or neutral? Show your work.
The Henry's Law constant for CH3Br gas in water at 25 oC is 0.159 mol/L-atm. Calculate the solubility of CH3Br in water at 25 oC in moles/L if the partial pressure of CH3Br in the headspace above a water sample is 1.71 atm.
sodium chloride is added slowly to a solution that is 0.010 m in cu ag and au. the ksp values for the chloride salts
If, in a certain experiment, over a specific time period, 0.0033 mol PH3 is consumed in a 1.5-L container each second of reaction, what are the rates of production of P4 and H2 in this experiment?
What are the possible values for the principal quantum number (n), the azimuthal quantum number (l) and the magnetic quantum number
what is the structure of a compound of molecular formula c10h14o2 that shows a strong IR absorbtion at 3150-2850cm^-1 and gives the following HNMR absorptions
How much heat is required to warm 225 g of ice from -44.1°C to 0.0°C, melt the ice, warm the water from 0.0°C to 100.0°C, boil the water, and heat the steam to 173.0°C?
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