5: Formulae, Equations and Amounts of Substance Flashcards
Use PPQs for spec points: 5-16
1
Q
What is the mole (mol)?
A
The unit for amount of a substance
2
Q
How many molecules are in a mole?
A
Avogadro constant
(L = 6.02 × 1023)
3
Q
What is the molar mass of a substance?
A
The mass per mole of the substance. gmol-1
4
Q
What is the molecular formula?
A
The number and type of atoms.
5
Q
What is the empirical formula?
A
The simplest whole number ratio of atoms.
6
Q
What does each letter represent in the ideal gas equation?
A
pV = nRT
p - pressure (Pa)
V - volume (m3)
n - amount (mol)
R - gas constant (Jmol-1K-1)
T - temperature (K)
7
Q
What colour is universal indicator in acidic, neutral and basic solutions?
A
Acid: Red / Orange
Neutral: Green
Base: Blue / Purple
8
Q
What is the atom economy of a reaction?
A
Atom economy = (RFM of desired product / RFM of all products) x 100
