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 containing exactly 6.022 x 10^23 particles (atoms, molecules, etc.).

Front

What is the mole ratio in a chemical reaction?

Back

The mole ratio is the ratio of the coefficients of any two substances in a balanced chemical equation, indicating the proportion in which they react or are produced.

Front

How do you determine the mole ratio from a balanced equation?

Back

The mole ratio is determined by looking at the coefficients of the reactants and products in a balanced chemical equation.

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 aluminum are needed to react with 3 moles of oxygen?

Back

According to the balanced equation 4 Al + 3 O2 → 2 Al2O3, 4 moles of Al react with 3 moles of O2, so 4/3 moles of Al are needed for 1 mole of O2.

Front

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

Back

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

Front

If 10 liters of carbon monoxide react, how many liters of carbon dioxide are produced?

Back

According to the equation 2CO + O2 → 2CO2, 10 liters of CO will produce 10 liters of CO2.

Front

What is the mole ratio of H2O to H3PO4 in the reaction P4O10 + 6 H2O → 4 H3PO4?

Back

The mole ratio of H2O to H3PO4 is 6:4.

Front

How do you convert grams of a substance to moles?

Back

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