How many helium atoms are present in 7.16 moles of helium atoms? What is the answer in scientific notation?

Iknow #2 is d. i just need to know why

The diagram below shows a cell placed in a solution.a cell is shown placed inside a beaker. it is labeled cell. the solution inside the beaker is labeled 40% salt solution and the solution inside the cell is labeled 20% salt solution.only water is allowed to move in and out of the cell. what will most likely happen to the cell? it will expand as water moves out of it. it will shrink as water moves out of it.it will expand as water moves into it. it will shrink as water moves into it.

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?