Mole Calculations Practice

Front

What is a mole in chemistry?

Back

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

Front

How do you calculate the number of moles from mass?

Back

Number of moles = Mass (g) / Molar mass (g/mol).

Front

What is the molar mass of water (H₂O)?

Back

The molar mass of water is approximately 18.02 g/mol.

Front

What is the balanced equation for the reaction of nitrogen and hydrogen to form ammonia?

Back

N₂ + 3H₂ → 2NH₃.

Front

How many moles of hydrogen are needed to react with 2 moles of nitrogen?

Back

6 moles of hydrogen are needed.

Front

What is percent composition in chemistry?

Back

Percent composition is the percentage by mass of each element in a compound.

Front

How do you calculate percent composition?

Back

Percent composition = (Mass of element in 1 mole of compound / Molar mass of compound) x 100%.

Front

What is the percent composition of carbon in C₄H₁₀?

Back

The percent composition of carbon in C₄H₁₀ is 82.8%.

Front

What is theoretical yield?

Back

Theoretical yield is the maximum amount of product that can be produced from a given amount of reactants, based on stoichiometric calculations.

Front

What is actual yield?

Back

Actual yield is the amount of product that is actually obtained from a chemical reaction.