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If a radioactive element has a half-life of 24 days, determine the rate constant and how long will it take for 1.5 x 10e21 atoms of the element to decay down to 2.7 x 10e19 atoms. Radioactive decay
A sample which is having 5.00 mL of seawater that had a density of 1.0116 g/mL was titrated with0.0998 M AgNO3 solution using K2CrO4 to indicate the end point. If 26.35 mL of 0.0998 M
If the temperature is reduced to -80C and the pressure increased to 760mmHg, discuss what volume will 300 ml of gas at the 20 C and a pressure of 355 mmHg occupy?
A12.3849 -g sample of iodine is accidentally contaminated with1.00070 g of ^129 I, naturally occurring iodine has an atomic mass of 126.9045, a synthetic radioisotope of iodine used in the treatment
If the H-H and H-F bond energies are 432 and 565 kJ/mol, respectively, calculate the F-F bond energy? The reaction of H2 with F2 produces HF with ΔH = -269 kJ/mol of HF.
The discovery of polyatomic organic molecules such as Cyanamid, H2NCN, in interstellar space has led some scientists to believe that the molecules from which life began on Earth may have come from s
A 0.1743g sample of impure oxalic acid is required and 39.8 mL of 0.08915 M NaOH solution for complete neutralization. Oxalic acid (COOH)2 is used to remove the rust stains and some ink stains f
Determine the pH of 0.25 M K2CO3.Determine the concentrations of HCO3-, and H2CO3 in the solution?H2CO3 is a diprotic acid with the Ka2 = 4.7 x 10-11 and Ka1 = 4.3
Calculate the new temperature after the sample is transferred to a new container with a pressure of 1.20atm and a volume of 2.50L? A sample of gas has a volume of 4250mL at 15Celsus and 745 mm Hg.
Illustrate Lewis structures for these two species. Include all resonance forms (include double headed arrow). Nitrogen-fixing bacteria convert urea [H2NC(O)NH2] into the nitrite ions(NO2-).
Determine the numbers of total moles of atoms are present in the 25 g of NaOH? Was given the answer of 1.875 mole of atoms but don't know the formula in order to figure it out.
How much salicylic acid and aceticanhyride would you need to make one million 100-tablet bottles of 325mg aspirin based on a 60% yield?
What will be the theoretical mass of potassium sulphate suppose you have 35ml of a 200 mg/l solution of H2SO4 and neutralized it with plenty of dilute KOH (potassium hydroxide).
The slow step in the conversion of alchohol to alkyl halide is the loss of water from the protonated alcohol to form the carbocation intermediate.
Determine the numbers of grams of each product are produced if 200.g of Fe, 300.g sulfuric acid, and 700.g of potassium chlorate are reacted? Determine the numbers of grams of each reactant remain?
Determine the ratio of J=1 to J=0 rotational energy level populations at the 200 K and 600 K for N_2, the rotational constant B = 5.96*10^10 s^-1.Calculate the limiting value of this ratio as T app
What is the temperature of the sample if B = 1.9227 cm^-1 for CO? In a rotational spectrum of CO, the maximum-intensity line is associated with the J=8.
Suppose the diameter of a hydrogen atom to be 100 pm. Interstellar space has an average temperature of about 10 K and an average density of hydrogen atoms of about one hydrogen atom per cubic meter.
Determine the pressure at which the mean free path of a hydrogen molecule well be 1.0 mm, 100 mm, and 1.00 m at 20 C.
Compute the overlap of two s atomic orbital, an s and an atomic orbital, and two p atomic orbital. Construct sketches of the newly produced molecular bonding and the anti-bonding orbital.
A 2.38 g sample of the compound at 41.1 °C exerts a pressure of 655 torr in a 0.569 L container. Analysis of a compound containing only phosphorus and fluorine was found to be 24.1% by mass phos
Determine the radius of the ball by assuming the Stake's Law and using that the viscosity (n) = 0.891 x10-3 kg m-1 s-1 @ 298 K.
Sketch a Born-Haber cycle and then summarize it by writing what ΔH of dissolution is equal to and how is the heat of dissolution of the salt NH4Cl(s) related to the lattice energy of N
Cl2FCCF2Cl(Freon 113, containing a C-C bond) Chloro-fluro-carbons (CFCs) are linked to the depletion of stratospheric ozone. They are also greenhouse gases.
Dichlorine oxide (Cl2O) is used in the manufacture of bleaching agents. Chlorine combines with oxygen in several proportions. Potassium chlorate (KClO3) is used in oxygen generators aboard aircraft.