Chapter 6.2, Problem 6.5P

Interpretation Introduction

Interpretation:

The number of moles and in gram present in ethyl alcohol ${\text{C}}_{\text{2}}{\text{H}}_{\text{6}}\text{O }$ should be determined for the given value Sample

Concept Introduction:

The Mole and Avogadro’s Number

•For convenience in considering reactions and calculating quantities, chemists think in terms of moles of substances.

•A mole is a quantity of particles defined as Avogadro’s number of particles or formula units of elements or compounds.

•The molecular or formula weight of a compound is the sum of the mass of all atoms in the formula.

•A mole also happens to be 22.4 L of an ideal gas under standard conditions, so 22.4 L of ideal gas represent one gram formula weight of the compound.

Gram-Mole Conversions

•A mole is defined as one gram formula or molecular weight of the compound. A mole is also defined as Avogadro’s number of formula units.

•It’s convenient to memorize and understand that the number of moles of a substance is equal to the number of grams divided by the gram formula weight.