An element - substance - NOT a mixture.
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Mole percent, or molar percent of a substance is the ratio of the moles of a substance in a mixture to the moles of the mixture. It represents the number of moles of a substance in a mixture as a percentage of the the total number of moles in the mixture. Mole % = (mol substance in a mixture) / (mol mixture) * 100
Steel Iron carbide or just plain carbide.
Mixture. An alloy is a mixture of metals.
Air is a mixture.
pure substance, propanone