1.2 Amount Of Substance Flashcards
Define relative molecular mass
Average mass of the naturally occurring isotopes of a compound, compared to 1/12 mass of an atom of carbon-12
Define relative atomic mass
Average mass of the naturally occurring isotopes of an atom, compared to 1/12 mass of an atom of carbon-12
Define the avogadro constant
Number of particles/atoms/ions in one mole of a substance
Write the equation that links mass of 1 mol, mass of 1 atom and avogadro constant
Mass of 1 mol = mass of 1 atom/molecule 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 estimated
Define atom economy
% of amount of reactants made into a certain (useful) product
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
Ideal gas equation
PV=nRT
Pressure X Volume = moles X gas constant X temperature
Pressure in Pa, volume in m^3, temperature in K, R=8.31
What are standard conditions?
25 degree Celsius or 289K
1atm or 100kPa
How do you convert between K and C temperatures?
Degree to kelvin +273
Kelvin to degree -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
