Stoichiometry Practice

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, etc.).

Front

How do you calculate the number of moles from grams?

Back

Number of moles = mass (g) / molar mass (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

In the reaction 2Al + 3Cl2 → 2AlCl3, what is the mole ratio of Al to AlCl3?

Back

The mole ratio of Al to AlCl3 is 1:1.

Front

What is the significance of a balanced chemical equation?

Back

A balanced chemical equation ensures that the number of atoms for each element is conserved in a reaction, reflecting the law of conservation of mass.

Front

How do you determine the limiting reactant in a chemical reaction?

Back

The limiting reactant is the substance that is completely consumed first, limiting the amount of product formed.

Front

What is the molar mass of O2?

Back

The molar mass of O2 is 32 g/mol.

Front

If 12.00 moles of NaClO3 produce how many grams of O2?

Back

576 g of O2.

Front

In the reaction N2 + 3H2 → 2NH3, how many moles of H2 are needed for 2 moles of N2?

Back

6 moles of H2 are needed.