2 - Amount of Substance Flashcards
What is a mole?
The amount of a substance that contains 6.022 x 10^23 particles.
What is the Empirical formula?
The formula that represents the simplest whole number ratio of the atoms of each element present in a compound.
What is the Molecular formula?
The actual number of atoms of each element in one molecule of the compound.
What is Avogadro’s constant?
The number of particles in 12g of carbon 12/ in one mole.
What is the formula for a mole?
n = m/ Mr
n = cv
What is the formula for concentration?
mole of solute
/
volume of solvent
What is the formula for atom economy?
(Mr of desired product
/
Mr of total products)
x100
What is the formula for percentage change?
(new - old
/
old)
x100
What are the advantages of high atom economy?
Reduce waste
Conserve resources
Maximise profit
What is the formula for the ideal gas equation?
PV = nRT
What is the difference between Mr and Ar?
Mr is the relative molecular mass, sum of the relative atomic masses (Ar) of all the atoms in a molecule.
Ar is the relative atomic mass, meaning the average mass of isotopes.
How do you calculate the molecular formula?
Mr of molecular formula
——————————- x empirical formula
Mr of empirical formula
What is the formula for percentage yield?
actual yield
————————- x 100
theoretical yield
