Mole calculations

Front

What is the formula to calculate the volume of a gas at standard temperature and pressure (STP)?

Back

The volume of a gas at STP can be calculated using the formula: Volume = moles × 22.4 L/mol.

Front

What is Avogadro's Number and what does it represent?

Back

Avogadro's Number is 6.022 × 10²³ and it represents the number of particles (atoms, molecules, etc.) in one mole of a substance.

Front

How do you determine the empirical formula from a molecular formula?

Back

To determine the empirical formula, divide the subscripts in the molecular formula by their greatest common divisor.

Front

What is the relationship between moles and mass?

Back

The relationship is given by the formula: moles = mass (g) / molar mass (g/mol).

Front

How do you convert grams to moles?

Back

To convert grams to moles, use the formula: moles = mass (g) / molar mass (g/mol).

Front

What is the empirical formula of a compound with 40% carbon and 60% oxygen by mass?

Back

The empirical formula is CO.

Front

What is the significance of the molar mass in mole calculations?

Back

Molar mass is used to convert between grams and moles, allowing for calculations involving the amount of substance.

Front

How many moles are in 36 grams of water (H₂O)?

Back

There are 2 moles of water in 36 grams (molar mass of H₂O is 18 g/mol).

Front

What is the definition of a mole in chemistry?

Back

A mole is a unit that measures the amount of substance, defined as containing exactly 6.022 × 10²³ particles.

Front

How do you find the number of particles in a given number of moles?

Back

To find the number of particles, multiply the number of moles by Avogadro's Number.