P1+2 ADD MORE 1e chemical formulae, equations and calculations Flashcards
1
Q
what is a mol?
A
moles, in which chemical amounts are measured
2
Q
what is yield?
A
the amount of product you get from a reaction
3
Q
why would you never get 100% yield in practice?
A
- reactants left in equipment
- reaction may be reversible
- lost during separation and purification stages
- impurities
4
Q
what is the actual yield?
A
the recorded amount of product obtained
5
Q
what is theoretical yield?
A
the amount of product obtained under perfect practical and chemical conditions
6
Q
what is the percentage yield?
A
compares the actual yield to theoretical yield
7
Q
how do you calculate percentage yield?
A
( actual yield / theoretical yield ) x 100
8
Q
formula for moles?
A
moles = mass/Mr(relative formula mass)
9
Q
formula for volume of a gas?
A
volume of a gas (dm3) = 24 x mol
10
Q
formula for concentration?
A
conc. (mol/dm3) = mol / volume (dm3)
