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
What is percentage yield
Percentage yield compare the actual and theoretical yield
What is the formula for percentage yield
Percentage Yield =
Mass of products made/
Max theoretical mass of products x 100
