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 balanced chemical equations.

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has equal numbers of each type of atom on both sides of the equation, ensuring the law of conservation of mass is followed.

Front

How do you determine the number of moles from grams?

Back

To determine the number of moles from grams, use the formula: Moles = Mass (g) / Molar Mass (g/mol).

Front

What is the molar mass of HCl?

Back

The molar mass of HCl (Hydrochloric acid) is approximately 36.46 g/mol.

Front

In the reaction Mg + 2HCl -> MgCl2 + H2, how many moles of HCl are needed for 1 mole of Mg?

Back

2 moles of HCl are needed for 1 mole of Mg.

Front

What is the mole ratio of CaC2 to Ca(OH)2 in the reaction CaC2 + 2H2O -> C2H2 + Ca(OH)2?

Back

The mole ratio of CaC2 to Ca(OH)2 is 1:1.

Front

How do you balance the equation C2H2 + O2 -> CO2 + H2O?

Back

The balanced equation is 2C2H2 + 5O2 -> 4CO2 + 2H2O.

Front

What is the significance of coefficients in a balanced equation?

Back

Coefficients indicate the relative number of moles of each substance involved in the reaction.

Front

How many grams of HCl are consumed by the reaction of 2.50 moles of magnesium?

Back

182 g of HCl are consumed.

Front

If 3.5 moles of H2O are consumed in the reaction CaC2 + 2H2O -> C2H2 + Ca(OH)2, how many moles of Ca(OH)2 are produced?

Back

1.75 moles of Ca(OH)2 are produced.