(08.04 LC) Which of the following is an acid? $$ \mathrm{He}(\mathrm{OH})_{2} $$ HCl LiBr $$ \mathrm{NH}_{3} $$

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Among the given options, let's evaluate each compound to determine which one is an acid:

1. **$$ \mathrm{He}(\mathrm{OH})_{2} $$**:
   - **Helium Hydroxide**: Helium is a noble gas and typically does not form stable compounds like $$ \mathrm{He}(\mathrm{OH})_{2} $$. This compound is not recognized as an acid.

2. **HCl (Hydrochloric Acid)**:
   - **Hydrochloric Acid** is a well-known strong acid commonly used in various chemical applications. It dissociates completely in water to release hydrogen ions (H⁺), which is characteristic of acids.

3. **LiBr (Lithium Bromide)**:
   - **Lithium Bromide** is a salt formed from the reaction of lithium hydroxide and hydrobromic acid. It is not an acid itself but rather a neutral salt.

4. **$$ \mathrm{NH}_{3} $$ (Ammonia)**:
   - **Ammonia** is a weak base. It can accept protons (H⁺) in reactions, which is the opposite behavior of acids.

**Conclusion**: Among the options provided, **HCl (Hydrochloric Acid)** is the acid.

**Answer:** HCl is the acid among the listed compounds.
HCl is the acid among the listed compounds.

(08.04 LC) Which of the following is an acid? \( \mathrm{He}(\mathrm{OH})_{2} \) HCl LiBr \( \mathrm{NH}_{3} \)

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