Amount of substance Flashcards
1
Q
What are chemical amounts measured in?
state the units
A
Moles
units = mol
2
Q
One mole of any substance contains how many particles?
A
6.02 x 10 23
3
Q
What is the Avogadro’s constant?
A
6.02 x 10 23
4
Q
Which has more particles - One mole of carbon or one mole of magnesium oxide?
A
They both have the same number
5
Q
State the equation to calculate number of particles in a give substance?
A
Number of particles =mol x Avogadro
6
Q
What is the term for a reactant that gets completely used up in a reaction?
A
Limiting reactant
7
Q
Why is one reactant often added in excess?
A
To make sure all of the other reactant is used up
8
Q
What volume does one mole of any gas occupy , at room temperature and pressure?
A
24 dm3
