Stoichiometry Assignment 3

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 in chemistry that represents 6.022 x 10^23 particles (atoms, molecules, ions, etc.) of a substance.

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 Al₂O₃?

Back

The molar mass of Al₂O₃ is approximately 101.96 g/mol.

Front

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

Back

4 Al + 3 O₂ → 2 Al₂O₃.

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 chemical reaction, limiting the amount of product formed.

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 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.

Front

What is the mole ratio in the reaction 4 Al + 3 O₂ → 2 Al₂O₃?

Back

The mole ratio is 4 moles of Al to 3 moles of O₂ to 2 moles of Al₂O₃.

Front

How many grams of Al can be produced from 51.9 grams of Al₂O₃?

Back

27.5 g Al can be produced.