Look at the following chemical compounds. State how many molecules of each reactant are present. (I’m sorry I’ve been working on this forever please help me)
A. NaOH. 
Na___ O____ H____
B. CO2. 
C____ O_____
C. 3CaO. 
Ca____ O_____
D. 2MgCl2. 
Mg ____ Cl____