HALF LIFES CHEMISTRY PROBLEMS
1)How much of a 888lb sample of Radium-189 Remains after 3 half Lives?

2)If you start with 200g or Uranium-282,How much will remain of 4 half lives?

3)How much of a 750 gram sample of 42K is left after 12.4 hours?

4)How much of an 88 gram sample of 232Th of remains after 4.2x10^10 years?

Given the following reaction: c3h8+5o2=3co2+4h20 how many grams of co2 will be produced 7 g of c3h8 and 98 g of o2

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?

How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 fe (s) + 3 o₂ (g) → 2 fe₂o₃ (s)