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 the mole concept in chemistry?

Back

The mole is a unit of measurement used to express amounts of a chemical substance, defined as exactly 6.022 x 10^23 particles (atoms, molecules, ions, 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 balanced equation for the combustion of methane (CH4)?

Back

The balanced equation is: CH4 + 2 O2 → CO2 + 2 H2O.

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. It can be determined by calculating the moles of each reactant and comparing their ratios based on the balanced equation.

Front

What is the molar mass of potassium bromide (KBr)?

Back

The molar mass of potassium bromide (KBr) is approximately 119.002 g/mol.

Front

How do you calculate the number of moles from a given mass of a substance?

Back

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

Front

What is the stoichiometric ratio in a balanced chemical equation?

Back

The stoichiometric ratio is the ratio of the coefficients of the reactants and products in a balanced chemical equation, indicating the proportions in which substances react and are produced.

Front

What is the significance of a balanced chemical equation?

Back

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

Front

How many moles of water are produced from the combustion of 1 mole of methane?

Back

2 moles of water (H2O) are produced from the combustion of 1 mole of methane (CH4).