CP_Flashcard 7: 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 the mole ratio in a chemical equation?

Back

The mole ratio is the ratio of the coefficients of any two substances in a balanced chemical equation, indicating the proportion in which they react or are produced.

Front

In the equation 2Al2O3 → 4Al + 3O2, what is the mole ratio of aluminum to oxygen?

Back

4:3

Front

How many moles of iron can be produced from 6 moles of H2 in the reaction Fe2O3 + 3H2 → 2Fe + 3H2O?

Back

4 moles Fe

Front

What is Avogadro's number?

Back

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

Front

How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely in the reaction 2KClO3 → 2KCl + 3O2?

Back

10.1 mol

Front

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the law of conservation of mass is obeyed, meaning the number of atoms of each element is the same on both sides of the equation.

Front

What is a limiting reactant?

Back

A 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 number of moles of each reactant and compare the mole ratios from the balanced equation.

Front

What is the product of the reaction between Fe2O3 and H2?

Back

The products are iron (Fe) and water (H2O).