Question 3 A 7.300 g sample of aluminum combined quantitatively with elemental selenium to form a definite compound. The sample of compound formed weighed 39.35 g. What is the empirical formula for this compound? Hint: M(Al) = 26.98 g.mol‒1, M(Se) = 78.96 g.mol‒1 options: AlSe2 AlSe Al3Se2 Al2Se Al2Se3

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.