3. Which of the following molecules have a not dipole moment? Mark all that apply Hydrochloric Acid (HCI) D Oxygen (O_(2)) D Sulfur Dioxide (SO_(2)) Ethane (C_(2)H_(6)) Hydrogen cyanide (HCN)

To determine which molecules have a dipole moment, we need to consider the polarity of the bonds within each molecule. A dipole moment occurs when there is a separation of positive and negative charges, which typically happens in molecules with polar bonds.

Let's analyze each molecule:

1. **Hydrochloric Acid (HCl)**: This molecule has a polar bond between hydrogen and chlorine, resulting in a dipole moment.

2. **Oxygen (O₂)**: This molecule consists of two oxygen atoms with identical electronegativities, so the bond is nonpolar, and there is no dipole moment.

3. **Sulfur Dioxide (SO₂)**: This molecule has a bent shape and polar bonds between sulfur and oxygen, resulting in a dipole moment.

4. **Ethane (C₂H₆)**: This molecule consists of nonpolar C-C and C-H bonds, and its symmetrical structure means there is no net dipole moment.

5. **Hydrogen Cyanide (HCN)**: This molecule has a polar bond between hydrogen and carbon, and another between carbon and nitrogen, resulting in a dipole moment.

Based on this analysis, the molecules that do not have a dipole moment are:

- Oxygen (O₂)
- Ethane (C₂H₆)

So, the correct answers are:
- Oxygen (O₂)
- Ethane (C₂H₆)