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 the mole concept?

Back

The mole is a unit of measurement in chemistry that represents 6.022 x 10²³ particles (atoms, molecules, ions, etc.). It allows chemists to count quantities of substances.

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). Formula: Moles = Mass (g) / Molar Mass (g/mol).

Front

What is the balanced equation for the reaction of aluminum with sulfuric acid?

Back

2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂.

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. It can be determined by comparing the mole ratios of reactants used.

Front

What is the molar mass of aluminum sulfate (Al₂(SO₄)₃)?

Back

The molar mass of aluminum sulfate is approximately 342.15 g/mol.

Front

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

Back

To calculate the mass of a product, use the balanced equation to find the mole ratio between reactants and products, convert moles of reactants to moles of products, and then convert moles of products to grams.

Front

What is the molar mass of oxygen (O₂)?

Back

The molar mass of oxygen (O₂) is approximately 32.00 g/mol.

Front

What is the significance of coefficients in a balanced chemical equation?

Back

Coefficients indicate the number of moles of each substance involved in the reaction, which is essential for stoichiometric calculations.

Front

How do you find the mass of a reactant needed for a reaction?

Back

To find the mass of a reactant needed, use the balanced equation to determine the mole ratio, convert moles of product to moles of reactant, and then convert moles of reactant to grams.