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 amounts of a chemical substance, defined as exactly 6.022 x 10²³ particles (atoms, molecules, ions, etc.).

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 balanced equation for the reaction of calcium carbide with water?

Back

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

Front

In the reaction CaC₂ + 2 H₂O ⟶ C₂H₂ + Ca(OH)₂, how many moles of Ca(OH)₂ are produced from 3.5 moles of H₂O?

Back

1.75 moles of Ca(OH)₂ are produced.

Front

What is the mole ratio of NH₃ to O₂ in the reaction 4NH₃ + 5O₂ → 4NO + 6H₂O?

Back

The mole ratio of NH₃ to O₂ is 4:5.

Front

How many moles of O₂ are consumed when 12.0 moles of NH₃ react completely?

Back

15.0 moles of O₂ are consumed.

Front

What is the balanced equation for the reaction of magnesium with hydrochloric acid?

Back

Mg(s) + 2 HCl(aq) ⟶ MgCl₂(aq) + H₂(g)

Front

How many moles of HCl are needed to produce 7.5 moles of MgCl₂?

Back

15 moles of HCl are needed.

Front

What is the balanced equation for the reaction of sodium iodate with hydroiodic acid?

Back

NaIO₃(aq) + 6HI(aq) ⟶ 3I₂(s) + NaI(aq) + 3H₂O(l)