chemical calculations Flashcards
1
Q
define relative atomic mass (Ar)
A
of any atom is the average mass of one atom compared to 1/12 the mass of carbon-12
2
Q
define relative molecular mass (Mr)
A
average mass of one molecule of an element or compound as compared to 1/12 the mass of carbon-12 atom
3
Q
formula to find the mass (g)
A
no. of moles × Ar/ Mr
4
Q
formula to find Ar/ Mr
A
mass ÷ no. of moles
5
Q
formula to find the moles
A
mass ÷ Ar/ Mr
6
Q
unit for moles
A
mol
7
Q
in moles answer, do we leave the answer in fraction or decimal point
A
decimal point
8
Q
relative molecular mass is for what compounds?
ionic or covalent
A
covalent
9
Q
relative formula mass is for what compounds?
ionic or covalent
A
ionic
