Chapter 6: Chemical Reactions: Mole & Mass Relationships

These flashcards cover key concepts from Chapter 6 about chemical reactions, the mole, and mass relationships, providing essential questions and answers for exam preparation.

What is the relationship between moles and mass in a chemical reaction?

Moles of element or compound relate to grams and the number of particles, atoms, ions, etc.

What is the mole?

A convenient counting unit used to measure quantities of molecules or ions by weight.

What is 'Molecular weight (MW)'?

The sum of the atomic weights of the atoms in a molecule.

What is 'Formula weight (FW)'?

The sum of the atomic weights of the atoms in one formula unit of an ionic compound.

How does the mass of one mole relate to molecular weight in amu?

The mass of one mole (in grams) is equal to the molecular weight in atomic mass units (amu).

What number represents Avogadro's number?

6.022 x 10^23, representing the number of particles in one mole.

How is molar mass expressed?

Molar mass is expressed in grams per mole (g/mol).

What chemical formula corresponds to aspirin?

C9H8O4.

How do subscripts in a chemical formula relate to moles?

They indicate the number of moles of each element in one mole of the compound.

What is a mole ratio?

The ratio of the moles of any two substances in a balanced chemical equation.

How can coefficients of a balanced equation be used?

Coefficients give the number of moles and can be used as conversion factors.

What is the molar mass of water (H2O)?

The molar mass of water is approximately 18.02 g/mol.

How do you determine the number of moles from grams?

Use the formula: Moles = Mass (g) / Molar Mass (g/mol).

What is the conversion factor for moles to grams?

1 mole = MW/FW in grams.

How many moles of Fe are needed for the reaction of 18.0 moles of O2 in the equation 4 Fe + 3 O2 -> 2 Fe2O3?

To find this, set up a mole ratio based on the coefficients from the equation.

How many moles of Fe2O3 can be formed from 3.1 mol of Fe?

Use stoichiometric ratios from the balanced equation to calculate the moles of Fe2O3.