Can some skilled chemists give me some backup with this work please? If you could that'd be much appreciated!

Problem page gaseous ethane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water . if of water is produced from the reaction of of ethane and of oxygen gas, calculate the percent yield of water. be sure your answer has the correct number of significant digits in it.

Using the periodic table, complete the table to describe each atom. type in your answers

Which three statements represent the benefits of performing experiments using computer simulations?