Selenium-83 has a half-life of 25 minutes. How many minutes would it take for a 12.0 mg sample to decay and have only 0.375 mg of it remain?

What term is missing from the central region that describes hypotheses, theories, and laws? popular predictable mathematical falsifiable

How many moles of bromine are needed to produce 3.23 moles of potassium bromide

0.88 moles of n2o5 (g) was placed in a sealed 1.00 l vessel. calculate the equilibrium concentration of n2o5. no2, and o2 and the equilibrium constant after equilibrium has been reached by 65.0% of the n2o5 decomposing.