mole concept Flashcards
(9 cards)
1
Q
define relative atomic mass
A
the relative atomic mass of an element is the weighted average mass of all the isotopes of that element relative to 1/12 the mass of an atom of carbon-12
2
Q
how to present relative atomic mass
A
Aᵣ of _ is _
3
Q
define relative molecular mass
A
- relative mass of a covalent compound
- relative molecular mass of a molecular substance is the avergae mass of one molecule of that substance relative to 1/12 the mass of an atom of carbon-12
4
Q
how to present relative molecular mass
A
Mᵣ (____) = ____ + ____
e.g. Mᵣ (CO₂) = 12.01 + 2(16)
5
Q
calculate percentage mass
A
number of atoms of the element in the formula x Aᵣ of the element
______________________________________________
Mᵣ of the compound
6
Q
number of molecules =
A
number of particles / 6.02x10²³
7
Q
1 mol =
A
6.02x10²³
8
Q
molar mass =
A
mass of 1 mol of substance
9
Q
A
