Please help with this! i've been struggling for a bit :(

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?

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?

Use the periodic table to determine how many grams of oxygen would be required to react completely with 859.0 g c2h2