Empirical formula of aluminum oxide has to be determined. Concept Introduction: Mole is S.I. unit. The number of moles is calculated as ratio of mass of compound to molar mass of compound. Molar mass is sum of the total mass in grams of all atoms that make up mole of particular molecule that is mass of 1 mole of compound. The S.I unit is g/mol . The expression to relate number of moles, mass and molar mass of compound is as follows: Number of moles = mass of the compound molar mass of the compound Empirical formula is simplest positive integer ratio of atoms in the compound. It only gives proportions of elements in compound.

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Chapter 11, Problem 11.14P

Interpretation Introduction

Interpretation:

Empirical formula of aluminum oxide has to be determined.

Concept Introduction:

Mole is S.I. unit. The number of moles is calculated as ratio of mass of compound to molar mass of compound.

Molar mass is sum of the total mass in grams of all atoms that make up mole of particular molecule that is mass of 1 mole of compound. The S.I unit is g/mol.

The expression to relate number of moles, mass and molar mass of compound is as follows:

Number of moles=mass of the compoundmolar mass of the compound

Empirical formula is simplest positive integer ratio of atoms in the compound. It only gives proportions of elements in compound.

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