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A compound differs from a mixture in that a compound has a definite composition by the mass of the elements it contains. Option C.
A compound is a substance formed by the chemical combination of two or more elements. A mixture is a substance formed by physically mixing two or more substances. A mixture is two or more substances that are not chemically combined, and a compound is two or more elements that are chemically combined.
A mixture is a combination of two or more substances in any proportion. This differs from compounds, which are composed of substances in fixed proportions. Substances in a mixture do not chemically combine to form new substances as compounds do. A compound is a substance formed by the combination of two other chemical elements. A mixture is a substance formed from two or more substances that can be separated using physical methods.
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