5:Formulae, Equations and Amount of Substance

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

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Front (Question)

What is Avogadro’s constant

Back (Answer)

6.022x10^23

Front (Question)

How do you calculate mass using moles and relative molecules mass (Mr)?

Back (Answer)

Mass = moles x Mr

Front (Question)

What is the definition of relative atomic mass?

Back (Answer)

The mean mass of an atom of an element, divided by one twelfth of the mean mass of an atom of the carbon-12 isotope

Front (Question)

What is the definition of relative molecular mass?

Back (Answer)

The mean mass of a molecule of a compound, divided by one twelfth of the mean mass of an atom of the carbon-12 isotope.

Front (Question)

What is the formula for sulphuric acid?

Back (Answer)

H2SO4

Front (Question)

What is the formula for nitric acid?

Back (Answer)

HNO3

Front (Question)

What is the formula for phosphoric acid?

Back (Answer)

H3PO4

Front (Question)

What is the formula for hydrogen sulfide?

Back (Answer)

H2S

Front (Question)

What is the equation for metal + water?

Back (Answer)

Metal + Water —> Metal hydroxide + hydrogen

#10

Front (Question)

What is the equation for metal + acid?

Back (Answer)

Metal + Acid —> Salt + Hydrogen

#11

Front (Question)

What is the equation for oxide + acid?

Back (Answer)

Oxide + Acid —> Salt + Water

#12

Front (Question)

What is the equation for hydroxide + acid?

Back (Answer)

Hydroxide + Acid —> Salt + Water

#13

Front (Question)

What is the equation for carbonate + acid?

Back (Answer)

Carbonate + Acid —> Salt + Water + Carbon dioxide

#14

Front (Question)

What is the equation for hydrogencarbonate + acid?

Back (Answer)

Hydrogencarbonate + Acid —> Salt + Water + Carbon dioxide

#15

Front (Question)

What is the equation for ammonia + acid?

Back (Answer)

Ammonia + Acid —> Ammonium salt

#16

Front (Question)

What is the definition of a mole?

Back (Answer)

A unit used to measure the amount of a substance

#17

Front (Question)

What does a metal carbonate break down into?

Back (Answer)

Metal carbonate —> Metal oxide + Carbon Dioxide

#18

Front (Question)

What is the definition of molar mass?

Back (Answer)

A substance’s mass in grams per mole

#19

Front (Question)

What is the empirical formula?

Back (Answer)

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

#20

Front (Question)

What is the molecular formula?

Back (Answer)

The actual number of each atom in a molecule

#21

Front (Question)

How do you calculate the emperical formula of a compound from its compositing by using mass or percentage?

Back (Answer)

1) Write down the mass, or if the percentage is given just assume that’s the mass in grams 2) Find the moles for each atom by mass = mr x moles 3) Divide everything by the smallest number 4) Make everything a whole number 5) Put it into simplest ratios

#22

Front (Question)

What is the ideal gas equation?

Back (Answer)

P x v = n x R x T

#23

Front (Question)

What is P in the ideal gas equation?

Back (Answer)

Pressure (Pa)

#24

Front (Question)

What is v in the ideal gas equation?

Back (Answer)

Volume (m^3)