Instructions: Refer to the compounds below to answer the following question(s). 
-Refer to instructions. Underline all the acidic hydrogen atoms in Compounds I through IV.
Definitions:
Mass
A measure of the amount of matter that an object contains, often expressed in kilograms or grams.
Mole
A unit in chemistry used to express amounts of a chemical substance, defined as containing exactly 6.02214076×10²³ particles, such as atoms or molecules.
S Atoms
Sulfur atoms, which are nonmetallic elements with the atomic number 16 known for their yellow crystals and role in biological systems.
Mass
A measure of the amount of matter in an object, typically in kilograms or grams, independent of its volume or any forces acting on it.
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