Stoichiometry

Front

What is Stoichiometry?

Back

Stoichiometry is the branch of chemistry that deals with the calculation of reactants and products in chemical reactions based on the conservation of mass.

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express the amount of a substance, defined as exactly 6.022 x 10²³ particles (atoms, molecules, ions, etc.).

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance (in grams) by its molar mass (in g/mol).

Front

What is the molar mass of a compound?

Back

The molar mass of a compound is the mass of one mole of that compound, calculated by summing the atomic masses of all atoms in its formula.

Front

What is the balanced equation for the reaction of aluminum and oxygen?

Back

4 Al + 3 O₂ → 2 Al₂O₃.

Front

How many moles of O₂ are needed to react with 4 moles of Al?

Back

3 moles of O₂ are needed to react with 4 moles of Al.

Front

What is the relationship between moles and volume for gases at STP?

Back

At Standard Temperature and Pressure (STP), 1 mole of any gas occupies 22.4 liters.

Front

How do you determine the limiting reactant in a chemical reaction?

Back

The limiting reactant is the substance that is completely consumed first in a reaction, limiting the amount of product formed.

Front

What is the stoichiometric coefficient in a balanced equation?

Back

The stoichiometric coefficient is the number in front of a compound in a balanced chemical equation, indicating the ratio of moles of that substance.

Front

How do you calculate the mass of a product formed in a reaction?

Back

To calculate the mass of a product, use the mole ratio from the balanced equation and the molar mass of the product.