Why don't we use gram or nanogram for example instead of the mol? ? what is it's benefit? ? i can't remember

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.