FC3: Moles 1

Question 1

What is relative atomic mass?

Answer 1

Average mass of an atom of an element relative to 1/12 of an atom of ^12C

Question 2

How do you calculate relative atomic mass?

Answer 2

Add together all isotopes x how many of each there are and divide by the total numbet

Question 3

What is molar mass?

Answer 3

Mr in the unit gmol^-1

Question 4

What is the formula triangle for mol relative to mass?

Answer 4

/Mass\
/Mr |Mol\
‘Mr Mole underground’
Mass/mr = mol

Question 5

What is the relationship between Avogadro’s number and the number of moles?

Answer 5

Moles = (no. of particles)/ avogadro’s number

Rearrange as necessary

Question 6

What is relative isotopic mass?

Answer 6

Mass of an isotope relative to 1/12 of an atom of ^12C