What is the molar of mass of copper (ii) sulfate cusou?

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.

The answer for #3 is c but i don't know why

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call