1.2 - Amount of Substance Flashcards
Define Relative Molecular Mass
The average mass of a molecule relative to one twelfth of the mass of an atom of carbon-12.
Define Relative Atomic Mass
The average mass of an atom of an element relative to one twelfth of the mass of an atom of carbon-12.
Define the Avogadro Constant
Number of particles/atoms/ions in one mole of a substance.
The equation that links mass of 1 mol, mass of 1 atom and Avogadro constant.
Mass of 1 mol = mass of 1 atom x Avogadro constant
Define percentage yield.
The % of a product produced by a reaction, compared to a theoretical maximum.
How would you calculate percentage yield?
Mass of useful product / expected mass of useful product.
What can the percentage yield of a practical be used to investigate?
Efficiency of practical techniques and whether reactions proceed as expected.
Define atom economy.
% of amount of reactants made into certain (useful) products.
How would you calculate atom economy?
Mr of atoms of useful products/ Mr of atoms of reactants.
What can the atom economy of a reaction be used to investigate?
Efficiency of using a specific reaction to produce a product.
What is the Ideal Gas Equation?
pV = nRT
Pressure (Pa) x Volume (m^3) = number of moles x gas constant (8.31) x temperature (K)
What are the standard conditions?
25*C/298K
1 atm/ 100kPa
How do you convert *C to K?
+273
Define Empirical Formula
Simplest whole number ratio of atoms in a compound.
What is the equation that links moles, concentration and volume?
Moles = concentration x volume
