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 10²³ particles (atoms, molecules, ions, etc.).

Front

How do you convert moles to grams?

Back

To convert moles to grams, multiply the number of moles by the molar mass of the substance (grams per mole).

Front

What is the molar mass of O₂?

Back

The molar mass of O₂ (oxygen gas) is approximately 32 g/mol.

Front

What is the balanced equation for the decomposition of sodium chlorate (NaClO₃)?

Back

2 NaClO₃ (s) → 2 NaCl (s) + 3 O₂ (g).

Front

How many grams of O₂ are produced from 12 moles of NaClO₃?

Back

576 g of O₂ are produced from 12 moles of NaClO₃.

Front

What is the stoichiometric ratio of SiO₂ to C in the reaction SiO₂ + 3C → SiC + 2CO?

Back

The stoichiometric ratio of SiO₂ to C is 1:3.

Front

How do you calculate the mass of a reactant needed in a reaction?

Back

To calculate the mass of a reactant needed, use the stoichiometric coefficients from the balanced equation and the molar mass of the reactant.

Front

What is the molar mass of carbon (C)?

Back

The molar mass of carbon (C) is approximately 12 g/mol.

Front

How many grams of hydrogen are produced from 120 g of Na in the reaction 2Na + 2H₂O → 2NaOH + H₂?

Back

5.2 g of hydrogen are produced from 120 g of Na.