C9 Relative Formula Mass Flashcards
1
Q
How do you find relative formula mass?
A
To find the relative formula mass (Mr) of a compound, you add together the relative atomic mass values (Ar values) for all the atoms in its formula.
2
Q
Find the Mr of carbon monoxide, CO.
The Ar of carbon is 12 and the Ar of oxygen is 16.
A
The Mr of carbon monoxide is 12 + 16 = 28.
3
Q
Find the Mr of sodium oxide, Na2O.
The Ar of sodium is 23 and the Ar of oxygen is 16.
A
The Mr of sodium oxide is (23 × 2) + 16 = 62.
