Answer:
D. 9.
Step-by-step explanation:
One formula unit of NaOH contains three atoms: 1 Na, 1 O, and 1 H.
3 formula units × (3 atoms/1 formula unit) = 9 atoms
Answer: D. 9
Explanation:
Atom is the smallest unit of matter which may or may not have independent existence. Example: [tex]H[/tex]
Molecule is the smallest unit of matter which has a independent existence. Example: [tex]H_2[/tex]
1 molecule of [tex]NaOH[/tex] has 1 atom of sodium, 1 atom of oxygen and 1 atom of hydrogen and thus total of 3 atoms.
Thus if 1 molecule of [tex]NaOH[/tex] has total of 3 atoms.
Thus 3 molecules of [tex]NaOH[/tex] has total of =[tex]\frac{3}{1}\times 3=9atoms[/tex]
Thus 9 atoms are represented by this formula [tex]3NaOH[/tex]
