Module 9: The Mole (Final Test)

Flashcards covering the key concepts from the lecture notes on the mole concept in chemistry.

What is a mole?

The SI base unit used to measure the amount of a substance, abbreviated mol.

How many representative particles are in one mole?

6.022 × 10²³ representative particles.

What is Avogadro’s number?

The number 6.0221367 × 10²³, which is the number of representative particles in a mole.

What is molar mass?

The mass in grams of one mole of any pure substance.

What does chemistry use methods for accurately counting?

Atoms, molecules, or formula units in a sample substance.

What is a representative particle?

Any kind of particle, such as an atom, molecule, formula unit, electron, or ion.

How do you use a conversion factor?

Multiply the known quantity by a conversion factor to express the quantity in the units you want.

What is the relationship between moles and representative particles?

1 mol of representative particles = 6.02 x 10^23 representative particles

What is the mole?

A unit that counts particles of matter directly.

How many representative particles does one mole of a pure substance contain?

Avogadro’s number of representative particles.

What do representative particles include?

Atoms, ions, molecules, formula units, electrons, and other similar particles.

Why do one-mole quantities of two different substances have different masses?

Different masses because the substances have different compositions.

How do you calculate molar mass from atomic mass?

Atomic mass followed by g/mol.

How do you calculate the mass of a given amount of moles?

Multiply the number of moles by the molar mass.

What is the formula to convert from mass to moles?

Moles = mass (g) / molar mass

What is the conversion pathway from mass to atoms?

Mass → moles → atoms

Why are moles in the center of mass

Mass must ALWAYS be converted to moles, before converting to atoms.

What is the relationship between an element's molar mass and its atomic mass?

Numerically equal to its atomic mass.

What is the molar mass of any substance?

The mass in grams of Avogadro’s number of representative particles of the substance.

How do you convert from mass to moles?

The inverse of molar mass.

For a pure element, what is the representative particle?

An atom.

For a compound formed from nonmetals (covalent compound), what is the representative particle?

A molecule.

For a compound formed from a metal and a nonmetal, what is the representative particle?

A formula unit.