Relative Formula Mass Flashcards
1
Q
Ar is
A
mass number
(atomic relative mass)
2
Q
Relative atomic mass takes into account the average …. of all …….
A
mass of all isotopes
3
Q
The mass number is how many times ….. the element is compared to ….. of Carbon-12
A
heavier compared to 1/12 of Carbon-12
ie the mass of potassium is 39, so its 39x heavier than 1/12 of carbon-12
4
Q
Relative atomic mass symbol vs relative formula mass symbol
A
Ar
Mr
5
Q
State atomic mass for
Oxygen
Carbon
Nitrogen
A
O = 16
C = 12
N = 14
6
Q
Explain how to do relative formula mass of CO2
A
Ar of C=12 Ar of O = 16
However there are two oxygen atoms
Mr of CO2 12 + (2 x 16)= 44
7
Q
How is this different to relative atomic mass formula
A
You don’t divide it by 100.
8
Q
Work out Relative Formula Mass
- NaOH
- Zn(OH)2
A
- 23 (Na) + 16 (O) + 1 (H) = 40
- 65 (Zn) + 16 (O) + 16 (O) + 1 (H) + 1 (H) = 99
