Why apt contains a large amount of energy

You are performing an experiment in a lab to attempt a new method of producing pure elements from compounds. the only problem is that you do not know what element will form. by your previous calculations you know that you will have 6.3 moles of product. when it is complete, you weigh it and determine you have 604.4 grams. what element have you produced?

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

What will most likely happen when two bromine atoms bond together?