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1.) A radioactive sample contains 1.85 g of an isotope with a half life of 3.5 days. What mass of the isotope will remain after 5.8 days? (Assume no excretion of the nuclide from the body) M=?
platinum crystallizes with a face-centered cubic unit cell. the radius of a platinum atom is 139 pm. calculate the
In our kinetics lab we used sodium thiosulfate as a mild reducing agent. Explain why this reagent would be a reducing agent. Also, what about potassium dichromate K2Cr2O7. Why is it such a good oxidizing agent.
Acetylene gas (C2H2) is produced by adding water to Calcium carbide CaC2. How many grams of acetylene are produced by adding water to 5g CaC2?
Calculate the Gibbs free energy change of transformation at 286 K and 1 atm. Tin transforms from gray tin to white tin at 286 K and constant pressure of 1 atm. The following data are given for both gray and white tin:CP = 21.6 + 18.2 x 10-3 T
What are the units for k in the rate expression (time unit is seconds) for a reaction with the following rate law? Rate = k[X]1[Y]0[Z]0
Hydrogen and iodine gases react to form hydrogen iodide gas. H2(g) + I2(g) → 2 HI(g) At a certain temperature and pressure 0.70 L of H2 reacts with 0.70 L of I2.
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.
The lower flammability limit (LFL) for a gas is the minimum concentration of the gas, in air, below which there is too little fuel to support combustion.
How many grams of Na3PO4 will be needed to produce 425 mL of a solution that has a concentration of Na+ ions of 0.900 M ?.
A reaction mixture initially containing 0.520 M H2S and 0.520 M SO2 was found to contain 1.0 x 10 -3. A second reaction mixture at the same temperature initially contains 0.245 and 0.335. calculate the equilibrium concentration of H2O in the secon..
How many grams of KHP are needed to exactly neutralize 27.4 mL of a 0.235 M potassium hydroxide solution ?
Show all of your work for each of the following problems. An aluminum nail of mass 5.00g is immersed into a solution of copper(II)nitrate. How many grams of elemental copper can be produced from the reaction
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