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1. The half life of polonium-210 is 138.4 days. How many milligrams of polonium-210 remain after 415.2 days if you start with 2.0 mg of the isotope?
2. Assuming a half-life of 1599 years, how many years will be needed for the decay of 15/16 of a given amount of radium-226?
3. The half-life of radon-222 is 3.824 days. After what time will one-fourth of a given amount of radon remain?
4. The half-life of cobalt-60 is 5.27 years. How many milligrams of cobalt-60 remain after 52.7 years if you start with 10.0 mg?
5. A sample contains 4.0 mg of uranium-238. After 4.46 x 10 9 years, the sample will contain 2.0 mg of uranium-238. What is the half-life of uranium-238?
What is the heat of combustion per gram of butane?
Aqueous solutions of each of the following salts {sodium acetate, sodium phosphate, sodium formate, and sodium carbonate} have a pH that is > 7. The reason for this is that the anion undergoes a so-called "hydrolysis reaction".
Why is this isolation so difficult? Please explain using the isoelectric point and the effect PH will have on the structure of your product
It takes 51.0 J to raise the temperature of an 10.2 g piece of unknown metal from 13.0C to 25.0C. What is the specific heat for the metal
Sodium bromate is used in a mixture which dissolves gold from its ores. Calculate the mass in grams of 4.68 mol of sodium bromate.
The density of liquid oxygen at its boiling point is 1.14 kg/L , and its heat of vaporization is 213 kJ/kg . How much energy in joules would be absorbed by 4.0 L of liquid oxygen as it vaporized?
Calculate the radius of a Au (gold) atom if Au atom has a face-centered unit cell ? it is given that its density = 19.32 g/cm 3 .?
The radius of a xenon atom is 1.3\times 10^-8 cm. A 100mL flask is filled with Xe at a pressure of 1.5atm and a temperature of 254K
A mixture was prepared with the following initial concentrations: [CO] =0.20M, [H2O] = 0.30 M. No formic acid, HCHO2, was initially present. What was the equilibrium concentration of HCHO2?
A 5.00 L flask at 279 K contains a mixture of He and O2 with a total pressure of 1.00 atm. If the mole fraction of O2 is 0.40, what is the mass fraction of O2?
A student added 27.20 cm^3 of 0.200 mol dm^-3 HCL to 0.188 g of eggshell. Calculate the amount, in mol, of HCL added. what is it?
what is the work in joules done on the system to compress He gas from 24.0 L to 12.5 L against a pressure of 1.5 atm at a constant temperature of 37.4 C?
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