What are some of the organisms in your community that you cannot see

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.

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )