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.

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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 balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients of the reactants and products to ensure that the number of atoms of each element is the same on both sides of the equation.

Front

What is the molar mass of a compound?

Back

The molar mass of a compound is the mass of one mole of that compound, usually expressed in grams per mole (g/mol).

Front

How do you calculate the number of moles from mass?

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

Front

What is the law of conservation of mass?

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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

What is the balanced equation for the combustion of methane (CH₄)?

Back

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

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

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The limiting reactant is the substance that is completely consumed first in a 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 an ideal gas occupies 22.4 liters.

Front

What is the significance of coefficients in a balanced equation?

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Coefficients indicate the relative number of moles of each reactant and product involved in the reaction.