608 Flashcard Practice: Molar Ratios and Conversions

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express amounts of a chemical substance. It is defined as the amount of substance that contains as many elementary entities (atoms, molecules, etc.) as there are atoms in 12 grams of carbon-12.

Front

What is a molar ratio?

Back

A molar ratio is the ratio of the amounts in moles of any two compounds involved in a chemical reaction. It is derived from the coefficients of the balanced chemical equation.

Front

How do you calculate the number of moles needed from a balanced equation?

Back

To calculate the number of moles needed, use the coefficients from the balanced equation to set up a proportion based on the moles of the substance you have.

Front

What is the balanced equation for photosynthesis?

Back

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂.

Front

If 2 moles of C₂H₆ react with 7 moles of O₂, what is the mole ratio of C₂H₆ to O₂?

Back

The mole ratio of C₂H₆ to O₂ is 2:7.

Front

How many moles of O₂ are needed to react with 6 moles of C₂H₆?

Back

21 moles of O₂ are needed.

Front

What is the mole ratio of Ba(OH)₂ to AlPO₄ in the reaction AlPO₄ + Ba(OH)₂ → Al(OH)₃ + Ba₃(PO₄)₂?

Back

The mole ratio is 3 mol Ba(OH)₂ / 2 mol AlPO₄.

Front

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the law of conservation of mass is followed, meaning that the number of atoms of each element is the same on both sides of the equation.

Front

What is the total number of moles of water needed to produce 2.5 moles of C₆H₁₂O₆?

Back

15 moles of water are needed.

Front

Define stoichiometry in chemistry.

Back

Stoichiometry is the calculation of reactants and products in chemical reactions based on the balanced equation.