Colour of crushed chalk + Iodine solution​

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?

Use the periodic table to complete this equation that represents nuclear fission processesun - ba c 3 n

How many moles of co2 are produced during the complete combustion of 3.6 moles of c2h6