The half-life of beryllium-11 is approximately 13.13 seconds and the atomic mass is 11.021661 u (equivalent to g/mol). Given a pure 124 g sample of beryllium-11, how many beta decays will occur in the first 5 minutes

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.