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A) By mass spectral analysis, a sample of strontium is known to contain 2.64x1010atoms of Sr-90 as the only radioactive element. The absolute disintegration rate of this sample is measured as 1238 disintegrations per minute. Calculate the half-life (in years) of Sr-90.
B) How long will it take (in years) for the disintegration rate of this sample to drop to 886 disintegrations per minute?
C) How long will it take (in years) for the disintegration rate of this sample to drop to 886 disintegrations per minute?
A solution is prepared by mixing 75.0 mL of 5.00 M HCl and 40.0 mL of 8.00 M HNO3. Water is then added until the final volume is 1.00 L. Calculate [H+], [OH -], and the pH for this solution.
Question- Consider a saturated solution of CaCl2. Which of the 3 processes will happen under each given circumstance? Circumstance 1) more calcium ion is added to the mixture? Circumstance 2: more sodium chloride is added to the mixture? Circumstan..
The molarity of a reactant in a second-order reaction falls from 0.150M to 0.130M in 30.0s What is the instantaneous rate of disappearance of the reactant at 30.0s
Calculate the applied pressure necessary to inflate the alveoli with the surfactant, in units of Torr. By what factor has the addition of the surfactant changed the inhalation pressure
3.21 A thermodynamic treatment allows predictions of the stability of DNA. The table below lists the standard Gibbs energies, enthalpies, and entropies of formation at 298 K of short sequences of base pairs as two polynucleotide chains come together:
copper is electroplated from CuSO4 solution. A constant curent of 4.39 A is applied by an external power supply. How long will it take to deposit 1.00x10^2g of Cu
A solution is prepared by dissolving 10.5 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 13.00 mL sample of this stock solution is added to 55.00 mL of water. Calculate the concentration of ammonium ions and sulfate ions ..
a sled-dog racer builds three identical igloos. one is used to store her supplies another houses her team of 12 dogs
Explain Formic acid (HCO2H, Ka = 1.8 × 10-4) is the principal component in the venom of stinging ants. Define what is the molarity of a formic acid solution if 25.00 mL of the formic acid solution needs 49.80 mL of 0.0567 M NaOH to reach the equiv..
avogadros number is big. if you had 6.02 x 1023 dollars and could spend it at 1 billion 109 per second for your entire
Iupac name of THE COMPOUND CH2=CHCOOC(CH3)3 AND LAMDA MAX
What is the value for k, the reaction constant, at 60 degrees if the Energy of activation = 75.5 kJ/mol?
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