Avogadro’s number, a fundamental constant in chemistry, refers to what specific quantity?
AThe boiling point of water in Kelvin
BThe exact number of elements on the periodic table
CThe atomic number of oxygen
DThe number of particles contained in exactly one mole of a substance
Explanation
Avogadro’s number, approximately 6.022 times ten to the twenty-third power, represents the number of particles, such as atoms or molecules, contained within exactly one mole of a substance. This remarkably large constant, named after Italian scientist Amedeo Avogadro, provides an essential bridge between the microscopic world of individual atoms and molecules and the macroscopic, measurable quantities chemists work with in a laboratory setting. Avogadro’s number remains one of the most fundamental and widely used constants throughout the field of chemistry. Explore more Everyday Science MCQs on mcqstutor to keep practicing.

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