3.1.2.1 Relative atomic mass and relative molecular mass Flashcards
1
Q
What is relative atomic mass?
A
The average mass of an atom of an element relative to 1/12th of the mass of an atom of Carbon-12
2
Q
Why is carbon used now instead of O and H in the past?
A
Gasses such as O and H are difficult to store
3
Q
What is relative molecular mass?
A
The average mass of a molecule relative to 1/12th of the mass of a carbon 12 atom.
4
Q
What is an isotope?
A
Atoms of the same element, with the same number of protons but different number of neutrons
5
Q
What is the formula for percentage composition? (by mass)
A
% composition = (Ar of element * no of atoms)/ (Mr of whole compound) *100
