Basic 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 a mole in chemistry?

Back

A mole is a unit of measurement used to express amounts of a chemical substance, defined as containing exactly 6.022 x 10^23 particles (atoms, molecules, ions, etc.).

Front

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

Back

To calculate the mass of a substance from moles, use the formula: mass (g) = moles × molar mass (g/mol).

Front

What is the molar mass of NaCl?

Back

The molar mass of NaCl (sodium chloride) is approximately 58.44 g/mol.

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has equal numbers of each type of atom on both sides of the equation, reflecting the law of conservation of mass.

Front

What is a mole ratio?

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A mole ratio is a ratio between the amounts in moles of any two compounds involved in a chemical reaction, derived from the coefficients of a balanced equation.

Front

How do you determine the coefficient in a balanced equation?

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The coefficient in a balanced equation indicates the number of moles of a substance involved in the reaction and is determined by balancing the number of atoms of each element.

Front

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

Back

Coefficients indicate the relative amounts of reactants and products in a chemical reaction, allowing for stoichiometric calculations.

Front

How many moles of hydrogen are needed to react with 1 mole of nitrogen in the reaction N2 + 3H2 → 2NH3?

Back

3 moles of hydrogen are needed to react with 1 mole of nitrogen.

Front

What is the first step in balancing a chemical equation?

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The first step in balancing a chemical equation is to write the unbalanced equation and count the number of atoms of each element on both sides.