Stoichiometry-moles/moles and mass/mass

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. One mole contains approximately 6.022 x 10²³ particles (atoms, molecules, 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 water (H2O)?

Back

The molar mass of water (H2O) is approximately 18.02 g/mol.

Front

In the reaction 2H2 + O2 → 2H2O, how many moles of H2O are produced from 2 moles of O2?

Back

2 moles of O2 produce 4 moles of H2O.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

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

In the reaction 4NH3 + 5O2 → 4NO + 6H2O, how many grams of NH3 are needed to produce 15.0 g of water?

Back

9.46 g of NH3 are needed to produce 15.0 g of water.

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.