Stoichiometry Practice

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

• 576 g of O₂ are produced.

• 480 g of O₂ are produced.

• 720 g of O₂ are produced.

• 360 g of O₂ are produced.

What is the balanced equation for the reaction of aluminum with oxygen?

• 4 Al + 3 O₂ → 2 Al₂O₃

• 2 Al + 3 O₂ → Al₂O₃

• 4 Al + O₂ → 2 AlO₃

• 3 Al + 2 O₂ → Al₃O₄

What is the significance of the coefficients in a balanced chemical equation?

• They indicate the temperature at which the reaction occurs.

• They represent the physical state of the reactants and products.

• They indicate the relative number of moles of each reactant and product involved in the reaction.

• They show the energy changes during the reaction.

What is stoichiometry?

• A branch of chemistry that focuses on the study of chemical bonds.

• The calculation of reactants and products in chemical reactions based on the conservation of mass.

• A method for measuring the temperature of chemical reactions.

• The study of the speed at which chemical reactions occur.

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

• 1:2

• 2:1

• 2:2 or 1:1

• 1:1

What is the molar mass of Ca(OH)₂?

• 72.06 g/mol

• 74.09 g/mol

• 76.12 g/mol

• 70.00 g/mol

Tags

NGSS.HS-PS1-1

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

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

• CaC₂(s) + H₂O(l) → C₂H₂(g) + CaO(aq)

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

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

How do you convert moles to grams?

• Grams = number of moles x molar mass (g/mol).

• Grams = number of moles / molar mass (g/mol).

• Grams = number of moles + molar mass (g/mol).

• Grams = number of moles - molar mass (g/mol).

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

• 22.4 liters

• 24.0 liters

• 20.0 liters

• 18.5 liters

What is a mole in chemistry?

• A unit of measurement for temperature.

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

• A type of chemical reaction.

• A measure of the volume of a gas.