C3: QUANTATIVE CHEMISTRY Flashcards
1
Q
Moles equation
A
moles (mols) = mass (g) / RFM (n = m/Mr)
2
Q
Concentration equation
A
conc. (g/dm^3) = mass (g) / volume (dm^3) (c = m/v)
3
Q
How do you convert mol/dm^3 to g/dm^3?
A
use mass = moles x RFM
4
Q
How do you convert from cm^3 to dm^3?
A
÷ 1000
5
Q
Volume of a gas
A
Volume of a gas (dm^3) = (mass of gas (g) / RFM of gas) x24 (v = (m/Mr)x24)
6
Q
% yield
A
% yield = (actual yield / theoretical yield) x 100
7
Q
What is Avogadro’s constant?
A
6.02 x 10^23
8
Q
How do you calculate the number of particles in a substance?
A
no. of particles = moles x Avogadro’s constant
9
Q
Atom economy
A
atom economy = (RFM of wanted products / RFM of total reactants) x 100
10
Q
Why is it better to use a reaction with a high atom economy?
A
-more sustainable
-less waste
-higher % of useful product
11
Q
A
