Which of the following best describes a molecule of a compound?
A molecule formed by the chemical combination of different elements in a fixed ratio
A compound is a pure substance made when atoms of two or more different elements are joined by chemical bonds. Its smallest unit that still shows the properties of the compound is a molecule of the compound.
By the law of definite proportions, the constituent elements in any given compound are always present in the same fixed ratio by mass (for example, H and O are in a 1:8 mass ratio in water).
A group of atoms of the same element forms a molecule of an element (like O2 or N2), not of a compound.
Variable ratios describe mixtures, and a physical mixture involves no chemical bonding at all.
Hence, a molecule of a compound is one formed by the chemical combination of different elements in a fixed ratio.
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