Stoichiometry Review

Front

What is stoichiometry?

Back

Stoichiometry is the calculation of quantities in chemical reactions, based on the relationships between reactants and products in a balanced chemical equation.

Front

Given the reaction 4NH3 + 7O2 -> 6H2O + 4NO2, how do you determine the mass of ammonia needed to react with a specific amount of oxygen?

Back

To determine the mass of ammonia needed, use the mole ratio from the balanced equation to find moles of NH3 required for the given moles of O2, then convert moles of NH3 to grams using its molar mass.

Front

How many moles of carbon monoxide are needed to react with a given mass of oxygen gas?

Back

Use the balanced equation to find the mole ratio between CO and O2, then convert the mass of O2 to moles and use the ratio to find moles of CO needed.

Front

In the reaction 2Fe + 3Cl2 -> 2FeCl3, how do you calculate the moles of chlorine gas required to produce a certain amount of iron (III) chloride?

Back

Use the mole ratio from the balanced equation to determine the moles of Cl2 needed for the desired moles of FeCl3.

Front

What is the molar mass of ammonia (NH3)?

Back

The molar mass of ammonia (NH3) is approximately 17.03 g/mol.

Front

How do you calculate the mass of a product formed in a chemical reaction?

Back

To calculate the mass of a product, first determine the moles of the limiting reactant, use the mole ratio from the balanced equation to find moles of the product, and then convert moles of the product to grams using its molar mass.

Front

What is the balanced equation for the decomposition of potassium chlorate (KClO3)?

Back

The balanced equation for the decomposition of potassium chlorate is 2KClO3 -> 2KCl + 3O2.

Front

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

Back

To find the limiting reactant, calculate the moles of each reactant, determine how much product can be formed from each reactant, and identify the one that produces the least amount of product.

Front

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

Back

A balanced chemical equation provides the mole ratios of reactants and products, which are essential for stoichiometric calculations.

Front

How do you convert grams of a substance to moles?

Back

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