How many oxygen atoms are in 2O₂?

Rationale

There are 4 oxygen atoms in 2O₂.

The equation 2O₂ indicates that there are two molecules of diatomic oxygen (O₂), and since each molecule contains two oxygen atoms, the total number of oxygen atoms is calculated by multiplying the number of molecules by the number of atoms per molecule.

A (2) YOUR ANSWER

This option incorrectly suggests that there are only 2 oxygen atoms present. However, since the notation 2O₂ signifies two separate O₂ molecules, each containing two oxygen atoms, the correct calculation yields a total of four oxygen atoms.

B (4) CORRECT

This is the correct choice as it accurately reflects the total number of oxygen atoms in 2O₂. Each O₂ molecule has two oxygen atoms, and with two molecules, the total is 2 x 2 = 4.

C (1) YOUR ANSWER

Choosing 1 as the number of oxygen atoms is incorrect because it undercounts the total. Each O₂ molecule consists of two atoms; therefore, it is impossible for 2O₂ to contain only one oxygen atom.

D (0) YOUR ANSWER

This option states that there are no oxygen atoms, which is incorrect. The notation 2O₂ clearly indicates the presence of oxygen molecules; thus, stating zero oxygen atoms is not valid.

Conclusion

The expression 2O₂ clearly indicates there are 4 oxygen atoms present, as it represents two molecules of oxygen, each composed of two atoms. Understanding molecular notation is crucial in chemistry, as it allows for accurate representation of the quantities of elements in various compounds. In this case, recognizing the structure of diatomic oxygen leads to the correct conclusion regarding the total atom count.

How many oxygen atoms are in 2O₂?

There are 4 oxygen atoms in 2O₂.

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