Question

4 of 10 next 05 contains 4 oxygen atoms cuso₄ contains 2 sodium atoms na₂o contains 12 oxygen atoms al₂(so₄)₃ contains 2 iron atoms fe₂o₃ contains 6 oxygen atoms c₆h₁₂o₆ contains 3 oxygen kno₃

Explanation:

Step1: Analyze $CuSO_4$

In $CuSO_4$, the sub - script of oxygen is 4, so it contains 4 oxygen atoms.

Step2: Analyze $Na_2O$

In $Na_2O$, the sub - script of sodium is 2, so it contains 2 sodium atoms.

Step3: Analyze $Al_2(SO_4)_3$

In $Al_2(SO_4)_3$, since there are 4 oxygen atoms in $SO_4$ and 3 $SO_4$ groups, the number of oxygen atoms is $4\times3 = 12$.

Step4: Analyze $Fe_2O_3$

In $Fe_2O_3$, the sub - script of iron is 2, so it contains 2 iron atoms.

Step5: Analyze $C_6H_{12}O_6$

In $C_6H_{12}O_6$, the sub - script of oxygen is 6, so it contains 6 oxygen atoms.

Step6: Analyze $KNO_3$

In $KNO_3$, the sub - script of oxygen is 3, so it contains 3 oxygen atoms.

Answer:

The matches are correct as presented in the image:

• "Contains 4 oxygen atoms" with $CuSO_4$
• "Contains 2 sodium atoms" with $Na_2O$
• "Contains 12 oxygen atoms" with $Al_2(SO_4)_3$
• "Contains 2 iron atoms" with $Fe_2O_3$
• "Contains 6 oxygen atoms" with $C_6H_{12}O_6$
• "Contains 3 oxygen atoms" with $KNO_3$