ย

StudySquare
Concentration and moles for AQA A-level Chemistry







This page covers the following topics:
1. Moles
Avogadro's constant: 1 mole = 6.02 x 10ยฒยณ atoms/molecules/protons. To convert from moles to atoms (or reverse) use Avogadro's constant. Moles can also be calculated by using the pyramid (mass = moles x RFM).

1
How many moles is 4.515 ร 10ยฒยณ atoms of a substance?
n = N/Nโ = 4.515 ร 10ยฒยณ รท (6.02 ร 10ยฒยณ) = 0.75 mol
0.75 mol
2
What is the moles of 2g of calcium carbonate (CaCOโ)?
2 / 100 = 0.02 mol
3
What is a mole?
1 mol = 6.02 ร 10ยฒยณ
image

4
Calculate the number of particles in 2 mol of a substance?
2 * 6.02 x 10ยฒยณ = 1.204 x 10ยฒโด
5
Calculate the number of particles in 0.5 mol of a substance?
0.5 * 6.02 x 10ยฒยณ = 3.01 x 10ยฒยณ
End of page
ย