What is the difference between the molar mass and the empirical formula mass of a compound? when are these masses the same, and when are they different? when different, how is the molar mass related to the empirical formula mass?

Molar mass is the mass of one stable molecule of a compound, that cannot join with another molecule of the same kind to form a new one, while an empirical formula is the molecular formula in its simplest form. E.g. empirical formula of ethene is CH2while its molecular formula is C2H4.

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