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 used to express the amount of a substance, defined as exactly 6.022 x 10²³ particles (atoms, molecules, ions, etc.).

Front

How do you calculate the number of moles from grams?

Back

Number of moles = mass (g) / molar mass (g/mol).

Front

What is the molar mass of Ca(OH)₂?

Back

The molar mass of Ca(OH)₂ is approximately 74.09 g/mol.

Front

What is the balanced equation for the reaction of CaC₂ with water?

Back

CaC₂(s) + 2H₂O(l) → C₂H₂(g) + Ca(OH)₂(aq).

Front

How many grams of O₂ are produced from 12 moles of NaClO₃?

Back

576 g of O₂ are produced.

Front

What is the stoichiometric ratio of H₂ to H₂O in the reaction 2H₂ + O₂ → 2H₂O?

Back

The stoichiometric ratio is 2:2 or 1:1.

Front

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

Back

The limiting reactant is the substance that is completely consumed first, limiting the amount of product formed.

Front

What is the volume of gas produced at STP for 1 mole of gas?

Back

At STP (Standard Temperature and Pressure), 1 mole of gas occupies 22.4 liters.

Front

How many liters of NH₃ are needed to react with 30.0 L of NO?

Back

20.0 L of NH₃ are needed.