A major advantage of the mole concept is that it enables a chemist to “count by weighing.” If one mole of potassium metal has a mass of 39.1 g, how many atoms are in a. 39.1g potassium
b. 19.6g potassium
c. 3.91g potassium

Which part of a feedback mechanism is able to monitor the conditions outside of cells and usually uses nerve cells to relay this information to an intergrating center

Can someone me with 1 to 4 plz. fast

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive