It’s due today by 11:59 please help

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.

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both

What is the subscript for oxygen in its molecular formula