CHEM 0010 Unit


UNIT # 7
Introduction
Objectives
Reading
7.1 Calculation of Formula Mass 7.2 Mole Concept 7.3 Atomic Mass Revisited 7.4 Calculation of Molar Mass 7.5 Calculations involving Avogadro # 7.6 Molar Volume of a Gas 7.7 Percent Composition 7.8 Empirical Formula 7.9 Empirical Mass to Molecular Formula
Problems 1 \| 2 \| 3 \| 4 \| 5

CALCULATIONS BASED ON FORMULAE

7.1 - Calculation of Formula or Molecular Mass

In section 5.1.3, we learned about formula units. The sum of the atomic masses of all the atoms which make up the compound is known as the formula mass of a compound. Formula mass is a general term applied to the mass of a substance based on summing up the atomic masses of the atoms in the chemical formula regardless of the type of bonding between atoms in the chemical formula. If the substance has covalent bonding (section 5.2), we can specifically refer to the sum of the atomic masses of all the atoms which make up the compound the molecular mass.

Here is how you determine the formula mass of a compound.

Section 8.1
Calculation of Formula or Molecular Mass ..p188

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