The half-life of polonium-218 s 3.0 min. If you start with 16 mg of polonium-218, how much time must pass for only 1.0 mg to remain?

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.