Counting Atoms in Molecules

How many Hydrogen atoms are in 4 H₂O? ​ (a)   How many oxygen atoms? ​ (b)  

• 8
• 4
• 1
• 2
• 3
• 5
• 6
• 7
• 9

How many O's are in Al₂(SO₄)₃

3(NH₄)₂CrO₄

Number of N: ​ ​ (a)  

Number of H: ​ (b)  

Number of Cr: ​ (c)  

Number of O: ​ (d)  

• 6
• 24
• 3
• 12
• 4
• 8
• 1
• 2
• 9

How many elements are in 2 C₆H₁₂O₇? (a)  

How many C: ​ (b)  

How many H: ​ (c)  

How many O: ​ (d)  

How many TOTAL atoms: ​ (e)  

• 3
• 12
• 24
• 14
• 50
• 7
• 6
• 25
• 52
• 60

2 CH₂CO₃OH

Number of C: ​ (a)  

Number of H: ​ (b)  

Number of O: ​ (c)  

• 4
• 6
• 8
• 2
• 3
• 1
• 5
• 7
• 9
• 10

How many Sulfur's are in Al₂(SO₄)₃

• 4

• 3

• 7

• 12

How many Nitrogen atoms are in the in H₃C₂ON₅?

• 2

• 3

• 4

• 5

How many atoms of Oxygen are in Fe(NO₃)₃ ?

• 6
• 3
• 9
• 1

Match the element to the number of atoms it has.

2 Al(C₂H₃O₄)₂

• 2

• aluminum

• 8

• hydrogen

• 12

• carbon

• 16

• oxygen

Match the formula to the description:

• 1 sulfur, 3 oxygen's

• SO₄

• 1 sulfur, 4 oxygen's

• 2 SO₃

• 2 sulfur's, 6 oxygen's

• SO₃

• 4 sulfur's, 6 oxygen's

• 2 S₂O₃

• 3 sulfur's, 12 oxygen's

• 3 SO₄