Stoichiometry Practice

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 in chemistry that represents 6.022 x 10²³ particles (atoms, molecules, ions, etc.) of a substance.

Front

How do you determine the mole ratio from a balanced chemical equation?

Back

The mole ratio is determined by the coefficients of the reactants and products in a balanced chemical equation.

Front

What is the balanced equation for the combustion of ethane (C2H6)?

Back

The balanced equation is: C2H6 + 7 O2 → 4 CO2 + 6 H2O.

Front

If 2 moles of H2 react with O2, how many moles of O2 are needed?

Back

1 mole of O2 is needed, based on the equation 2H2 + O2 → 2H2O.

Front

What is the mole ratio of reactants to products in the reaction: 2 Al + 3 CuCl2 → 3 Cu + 2 AlCl3?

Back

The mole ratio is 2 moles of Al to 3 moles of CuCl2.

Front

How many moles of Na are needed to react with 1 mole of S in the reaction 2Na + S → Na2S?

Back

2 moles of Na are needed.

Front

What is the total number of moles of products formed in the reaction: 3 Mg + Fe2O3 → 3 MgO + 2 Fe?

Back

5 moles of products are formed (3 moles of MgO and 2 moles of Fe).

Front

In the reaction C2H6 + 3 O2 → 2 CO2 + 3 H2O, what is the mole ratio of CO2 to H2O?

Back

The mole ratio is 2 mol CO2 : 3 mol H2O.

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.