The average atomic mass of potassium is approximately 39 u. What is the mass of 2.0 mol of potassium

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.

Write a paragraph that provides examples of each stage of volcanic activity, a description of the volcano, and facts about each stage.

If two objects at different te,peraure are in contact with each other what happens to their temperature