I need help on 5,6,7, and 9. Please show me how you got the answer.

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.

Why did southern business leaders want to increase the number of slaves

What can be found in the ionosphere