3. Amount of Substances

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

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Front (Question)

What is the unit of amount of substance?

Back (Answer)

Mole (mol)

Front (Question)

How to calculate the number of moles?

Back (Answer)

• mass / Mr • concentration x volume • volume / 24 (at room temperature and pressure)

Front (Question)

What is Avogadro constant?

Back (Answer)

6.02 x 10^23, the number of atoms per mole of carbon-12.

Front (Question)

What is molar mass?

Back (Answer)

Mass per mole (Mr)

Front (Question)

What is the unit of molar mass?

Back (Answer)

g/mol

Front (Question)

What is molar gas volume?

Back (Answer)

Gas volume per mole

Front (Question)

What is the unit of molar gas volume?

Back (Answer)

dm3/mol

Front (Question)

What is empirical formula?

Back (Answer)

The simplest whole number ratio of atoms of each element present in a compound.

Front (Question)

How to calculate the empirical formula?

Back (Answer)

• convert mass into moles • divide by the smallest moles • write the empirical formula

#10

Front (Question)

What is molecular formula?

Back (Answer)

The number and type of atoms of each element in a molecule.

#11

Front (Question)

How to calculate the molecular formula?

Back (Answer)

• convert % by mass into moles • find the empirical formula • calculate the Mr of the empirical formula • find the mole of the substance • write the molecular formula

#12

Front (Question)

What does anhydrous mean?

Back (Answer)

Substances that contain no water molecules.

#13

Front (Question)

What does hydrated mean?

Back (Answer)

A crystalline compound that contains water molecules.

#14

Front (Question)

What is water of crystallisation?

Back (Answer)

Water molecules that are bonded into a crystalline structure of a compound.

#15

Front (Question)

What is the ideal gas equation?

Back (Answer)

pV=nRT

#16

Front (Question)

What is the ideal gas constant?

Back (Answer)

8.314 J/mol/K

#17

Front (Question)

What is the unit of pressure in the ideal gas equation?

Back (Answer)

Pascal (Pa)

#18

Front (Question)

What is the unit of volume in the ideal gas equation?

Back (Answer)

m^3

#19

Front (Question)

What is the unit of temperature in the ideal gas equation?

Back (Answer)

Kelvin (K)

#20

Front (Question)

How to calculate from °C to K?

Back (Answer)

+273

#21

Front (Question)

How to calculate the percentage yield?

Back (Answer)

(actual yield of product / theoretical yield of product) x 100

#22

Front (Question)

Why is the percentage yield never be 100%?

Back (Answer)

• side reactions • incomplete reactions • gases lost during reactions • products left on apparatus

#23

Front (Question)

What is limiting reagent?

Back (Answer)

The reactant that is not in excess, which will be used up first and stop the reaction.

#24

Front (Question)

How to calculate the atom economy?

Back (Answer)

(Mr of desired product / Mr of all product) x 100