Stoichiometry and Limiting Reactants

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 balanced equations.

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 balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients of the reactants and products to ensure that the number of atoms for each element is the same on both sides of the equation.

Front

What is Avogadro's Number?

Back

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

Front

What is the first step in solving a stoichiometry problem?

Back

The first step is to write a balanced equation for the chemical reaction.

Front

Given the equation 2H2 + O2 → 2H2O, how many moles of water are produced from 4 moles of H2?

Back

4 moles of water are produced.

Front

What is the molar mass of MgCl2?

Back

The molar mass of MgCl2 is approximately 95.21 g/mol.

Front

If you have 10 g of Mg and 20 g of HCl, how do you determine the limiting reactant?

Back

Calculate the moles of each reactant, then use the balanced equation to find which reactant produces less product.

Front

What is the theoretical yield?

Back

The theoretical yield is the maximum amount of product that can be produced from a given amount of reactants, based on stoichiometric calculations.

Front

What is the percent yield?

Back

Percent yield is the ratio of the actual yield to the theoretical yield, multiplied by 100.