Stoichiometry

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What is Stoichiometry?

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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?

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A mole is a unit of measurement used to express amounts of a chemical substance, defined as exactly 6.022 x 10²³ particles (atoms, molecules, ions, etc.).

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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.

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How do you calculate moles from grams?

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To calculate moles from grams, use the formula: Moles = Mass (g) / Molar Mass (g/mol).

Front

What is the molar mass of water (H₂O)?

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The molar mass of water (H₂O) is approximately 18.02 g/mol.

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

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

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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. It can be determined by comparing the mole ratio of reactants used to the mole ratio in the balanced equation.

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What is the stoichiometric coefficient in a balanced equation?

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The stoichiometric coefficient is the number in front of a compound in a balanced chemical equation that indicates the relative number of moles of that substance.

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How many moles of hydrogen are produced from 2 moles of sodium reacting with water?

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According to the reaction 2 Na + 2 H₂O → 2 NaOH + H₂, 2 moles of sodium produce 1 mole of hydrogen.

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What is the molar mass of silver bromide (AgBr)?

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The molar mass of silver bromide (AgBr) is approximately 187.77 g/mol.