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By mass spectral analysis, a sample of strontium is known to contain 2.64x1010 atoms 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. How long will it take (in years) for the disintegration rate of this sample to drop to 843 disintegrations per minute?
According to Bohr model, the red line on the spectrum is hydrogen changing from what state (ni= ?) and to what state (nf = ?) ? Give calculation steps below to prove your choice.
In temperature dependance of reaction rates, if you use R=8.314 J/molxK, what should the units be for Ea in the absence of conversions
What is the dissociation constant, Kd, of a ligand with a percent occupancy (or fractional saturation) of 50% when [ligand] = 10-7 M
Compute the number of kilograms of hydrogen that pass per hour through a 5-mm-thick sheet of palladium having an area of 0.20 m2 at 500°C. Assume a diffusion coefficient
When 15 mL of a solution containing 1.2 M Na2S is diluted to 30mL, a dilute solution is formed. How many moles of Na+ ions are contained in 20 mL of the dilute solution
At 570. mm Hg and 25C, a gas sample has a volume of 2270 mL. What is the final pressure (in mm Hg) at a volume of 1250 mL and a temp of 175C?
A sample of sodium reacts completely with 0.426 of chlorine, forming 702 of sodium chloride. What mass of sodium reacted?
What mass of oxygen will react with 2.64g of magnesium? 2Mg(s)+O2(g)-->MgO(s)
How will the melting point of your semicarbazone derivative be affected if the derivative is not dry enough
Define nucelophilicity. Give a detailed explanation as to why hydroxide is a much better nucleophile than water.
A ball is thrown horizontally from the top of a building 19.0 m high and lands 63.7 m from base of the building.
Write equations for the mechanistic steps in the dehydration of cyclohexanol assuming an E1 mechanism.
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