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A sample of moon rock was examined by mass spectroscopy. Merely 11.47% of the original 4019k remained the rest had decayed to 4018Ar. the initial amount, No (Nknot) would be 100%. Half-life of potassium-40, t1/2 = 1.28 * 109 years. Answer for the rate constant K.
What are the other other concentration units. 1. mass percent 2. mass of H2SO4 in 1 L 3. mass of 1 L 4. mass percent 5. kg H20 6. molality 7. mole fraction H2SO4
When looking at an energy diagram, how do you determine what the rate-limiting step is? How do you determine what the energy of activation is for the rate determining step
Draw the structure(s) of the epoxide(s) you would obtain by formation of a bromohydrin from cis-3-heptene, followed by treatment with base
Consider the titration of a 25.0 -mL sample of 0.105 M HC2H3O2 with 0.125 M NaOH. Determine the pH at 6.00mL of added base, the pH at the equivalence point.
The half-life of C-14 is 5730 years. A fossil was analyzed and determined to have a carbon-14 level that is 50.0 % that of living organisms. How old is the fossil?
Use the Ksp values in the table 16.2 to calculate the molar solubility of the following compound in pure water. Before Addition ~0.00mol 0.100mol 0.100mol
What is the formula and name for the following (1) KOH+HBr,(2) Zn+AgNO3,(3) K+NaCl, (4) HCl+NaOH (5) BaCl2+NaSO4 (6) H2+O2
The valve between a 5-L tank containing a gas at 9 atm and a 10-L tank containing a gas at 6 atm is opened. Calculate the final pressure.
Write chemical equations for the reaction of calcium with the following substances, making sure that the numbers and kinds of atoms are the same on both sides of the equations.
Calculate the energy in joules required to ionize a hydrogen atom when its electron is initially in the n = 4 energy level.
The first ionization energy of Ca is 590 kJ/mol and its second ionization energy is 1145 kJ/mol. The heat of sublimation of Ca is 178 kJ/mol. The bond energy of Br2 is 193 kJ/mol, the heat of vaporization of Br2(l) is 31 kJ/mol , and the electron ..
The activation energy for a reaction is 37.6 kJ/ mol. The rate constant for the reaction is 5.4 x 10^3 at 45 degrees Celcius. Calculate the rate constant at 145 degrees celcius
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