PRACTICE: Limiting Reactants

Front

What is a limiting reactant?

Back

The limiting reactant is the substance that is completely consumed in a chemical reaction, limiting the amount of product that can be formed.

Front

How do you determine the limiting reactant in a reaction?

Back

To determine the limiting reactant, calculate the moles of each reactant and compare the mole ratios required by the balanced equation.

Front

What is the molar mass of H2?

Back

The molar mass of H2 (hydrogen gas) is approximately 2 g/mol.

Front

What is the molar mass of F2?

Back

The molar mass of F2 (fluorine gas) is approximately 38 g/mol.

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, which is the number of particles (atoms, molecules) in one mole of a substance.

Front

What is the mole ratio?

Back

The mole ratio is the ratio of moles of one substance to the moles of another substance in a balanced chemical equation.

Front

If you have 2 moles of H2 and 1 mole of F2, which is the limiting reactant?

Back

H2 is the limiting reactant because it will be consumed first based on the stoichiometry of the reaction.

Front

What is the balanced equation for the reaction between H2 and F2?

Back

The balanced equation is H2 + F2 → 2HF.

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance by its molar mass.

Front

What is the product formed when H2 reacts with F2?

Back

The product formed is hydrogen fluoride (HF).