Chem Y8i - How many atoms are there all together in a single group of the following chemicals?

(NH₄)₂S

11

Pb₃(SO₄)₂

13

Fe₂(SO₄)₃

17

HCl

2

Hydrogen Gas*

2

NaCl

2

(NH₄)₃PO₄

20

C₆H₁₂O₆

24

Al(NO₃)₃

3

Carbon Dioxide

3

Water

3

Ammonia

4

K₃P

4

Al₂O₃

5

Ca(OH)₂

5

HNO₃

5

Methane

5

Na₂CO₃

6

H₂SO₄

7

Acetic Acid / Ethanoic Acid*

8