Stoichiometry Practice-Gen Chem

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 does it mean to balance a chemical equation?

Back

Balancing a chemical equation means ensuring that the number of atoms of each element is the same on both sides of the equation, reflecting the law of conservation of mass.

Front

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

Back

Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g) (Balanced: 1,2,1,1)

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 Ca(OH)₂?

Back

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

Front

How many moles of Ca(OH)₂ are produced from 3.20 moles of CaC₂?

Back

From the balanced equation, 1 mole of CaC₂ produces 1 mole of Ca(OH)₂, so 3.20 moles of CaC₂ produce 3.20 moles of Ca(OH)₂.

Front

What is the molar mass of C₂H₂?

Back

The molar mass of C₂H₂ (ethyne) is approximately 26.04 g/mol.

Front

How do you calculate the grams of a substance from moles?

Back

To calculate grams from moles, use the formula: Mass (g) = Moles × Molar Mass (g/mol).

Front

What is the balanced equation for the combustion of C₂H₂?

Back

2 C₂H₂(g) + 5 O₂(g) → 4 CO₂(g) + 2 H₂O(g) (Balanced: 2,5,4,2)

Front

How many moles of water are produced from the combustion of 25.0 grams of C₂H₂?

Back

0.960 moles of water are produced when 25.0 grams of C₂H₂ are consumed.