3paragraph essay on what i did this summer

Hey guys so i need to know what is _nh3+> nh4oh ~chemistry~

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.