Moles Flashcards
1
Q
What is a mole?
A
The mole is a unit and measures the amount of a substance.
2
Q
What is Avogadro’s number?
A
6.02 x 10 23 as power near10
3
Q
What is the formula for number of moles?
A
Number of moles= mass in g (of an element or compound)
divide
M small r
4
Q
How many moles are there in 66g of carbon dioxide (CO2)?
A
m small r of CO2=12+(16x2)=44
no of moles= mass (g) divide m small r= 66 divide 44= 1.5mol
5
Q
formula of of percentage mass of an element in a compound
A
A small r x number of atoms of that element
divide x 100
M small r of the compound
6
Q
formula for number of moles
A
Mass
divide
Relative atomic mass
