Topic 3 (Quantitative Chemistry) Flashcards
What is relative formula mass
The sum of the atomic masses of all the atoms in a molecular formula
What it Mr
Relative Formula Mass
What is Ar
Atomic mass
What is the equation for %Mass
Ar/
Mr
How big is a mole
6.02 x 10^23
What is another name for a mole
Avogrados Number
Why are moles so important
One mole of any substance will have a mass in grams equal to its Ar
E.g Carbon Ar = 12
1 mole of carbon = 12g
What is the equation for moles
Moles=
Mass/
Mr
One mole of gas equals
24dm^3
24 decimetres cubed
Equation for volume of gas
Volume of gas=
Mass/
Mr X 24
What is concentration
Concentration is how crowded things are
What is the equation for concentration
Concentration =
Mass of solute/
Volume of solvent
OR
Concentration =
Moles of solute/
Volume of solvent
What is atom economy
Atom economy of a reaction tells you how much of the mass of reactants is wasted and how much ends up as desired product
What is the equation for atom economy
Atom Economy =
RFM of desired product/
RFM of all reactants X 100
Why is high atom economy good
Less waste is better for profits for the business and the environment
