Question

nahco₃
sodium bicarbonate - baking soda
how many atoms
1 1 1 3
element c h o
c₂h₄o₂
acetic acid - vinegar
how many atoms
element mg o h
mg(oh)₂
magnesium hydroxide - milk of magnesia
how many atoms

Explanation:

Step1: Analyze $C_2H_4O_2$

The sub - scripts indicate the number of atoms of each element. There are 2 carbon (C) atoms, 4 hydrogen (H) atoms and 2 oxygen (O) atoms.

Step2: Analyze $Mg(OH)_2$

The sub - script outside the parentheses multiplies the atoms inside. For magnesium (Mg), there is 1 atom. For oxygen (O), there are 2 atoms (since the sub - script 2 multiplies the 1 O in OH), and for hydrogen (H), there are 2 atoms.

Answer:

Element	C	H	O
Element	Mg	O	H
How many atoms	1	2	2