RAM, molecular mass, Avagadros number, moles

ram definition

average mass of an atom of an element compared to 1/12th the mass of carbon -12

Mr definition

average mass of a molecule compared to 1/12th the mass of carbon-12

what is the term relative formula mass used for and why?

ionic compounds as they are not molecules

How many times heavier is Helium (7) than atom of Hydrogen?

7 times heavier

What does 18g of water contain

The same number of molecules as there are atoms in 1g of Hydrogen

Value for Avagadros constant?

6.022 × 10²³

What is Avagadros constant

Number of atoms in 12g of carbon-12

Mole

Unit for amount of substance

What does the relative molecular mass of a substance contain?

One mole of entities

Moles formula

Mass/Mr

Mole formula

Conc * volume

concentration unit

mol/dm3

How to convert from cm3 to dm3

Divide by 1000

Room temperature

298 Kelvin ~ 25 degrees Celcius

Standard pressure

1000kPa

What will one mole of any gas occupy?

Volume of 25dm3

Formula relating pressure, moles, temp, gas constant

Pressure=moles*gas constant*temperature

Temperature unit

Kelvin

Gas constant value

8.314J/molK

Hydrated copper sulphate and colour

CuSO4.xH20 (blue)

Anhydrous copper sulphate and colour

CuSO4

What does the dot represent

That water is dative covalently bonded to copper sulphate

What is one mole of

The Avagadro number of particles,atoms, ions,electrons,molecules

Number of particles formula

moles * Avagadros constant