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?

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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.).

Front

How do you convert grams to moles?

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To convert grams to moles, divide the mass of the substance (in grams) by its molar mass (in g/mol).

Front

What is the molar mass of water (H₂O)?

Back

The molar mass of water (H₂O) is approximately 18 g/mol.

Front

What is the balanced equation for the combustion of butane (C₄H₁₀)?

Back

The balanced equation is: 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O.

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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 chemical 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.

Front

What is the significance of the coefficients in a balanced chemical equation?

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The coefficients indicate the relative number of moles of each substance involved in the reaction, which is essential for stoichiometric calculations.

Front

How many moles of water are produced from 2 moles of hydrogen gas (H₂)?

Back

According to the equation 2H₂ + O₂ → 2H₂O, 2 moles of H₂ produce 2 moles of H₂O.

Front

What is the molar mass of potassium chlorate (KClO₃)?

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The molar mass of potassium chlorate (KClO₃) is approximately 122.55 g/mol.

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If 4 grams of H₂ are used, how many grams of H₂O are produced?

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Using the reaction 2H₂ + O₂ → 2H₂O, 4 grams of H₂ (2 moles) produce 36 grams of H₂O.