If knownperson(me) pays you to do my last question could you ?

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions