1e- Moles❗️ Flashcards
1
Q
What’s the formula for calculating moles
A
Mass/Mr
2
Q
What is the formula for relative formula mass
A
Some of total atomic masses of element
3
Q
What is the formula for percentage by mass of an element in a compound
A
Number of atoms of an element multiplied by
Ar/Mr x100
4
Q
what is the formula for percentage yield
A
Actual yield/theoretical yield (x 100)
5
Q
What are reasons for less than 100% yield
A
- Incomplete reactions
- practical losses during experiment
- side reactions
6
Q
How to calculate volume
A
Moles x 24
7
Q
How to calculate moles
A
Volume/24
8
Q
What is a limiting reactant
A
The element all used up at the end of reaction
9
Q
What’s the formula for calculating the % of element in a compound
A
Relative atomic mass of element x number of atoms of element in formula / relative formula mass of compound
10
Q
How do you find molecular formula
A
Mr / Rfm of empirical formula
