Which of these is a reason an engineer may choose to use a prefabricated
building component?

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.

How can one make a supersaturated solution? (apex)

How many atoms or molecules are there in a mole of a substance?