2 - Amount of Substance Flashcards
What is the relative atomic mass of an element?
The weighted average mass of an atom of an element, taking into account its naturally occurring isotopes, relative to 1/12th of the relative atomic mass of one C-12 atom.
What is the relative molecular mass of a molecule?
The mean mass of that molecule compared to 1/12th the relative atomic mass of an atom C-12.
What is Avogadro’s constant?
6.022 x10^23
What is the ideal gas equation?
PV = nRT
pressure (Pa) x volume (m3) = number of moles x temperature (K) x 8.31
What is empirical formula?
The formula which represents the simplest ratio of atoms of each element in a compound.
How do you find the molecular formula of a compound?
Relative molecular mass/relative mass of empirical formula
How do you find concentration given the number of moles and volume?
Number of moles/volume (dm3)
What is the stoichiometry of a reaction?
The ratio in which the reactants react, and products form.
What type of equation is formed by removing spectator ions?
Ionic equation
What is the formula for atom economy?
100 x (Mass of desired product/total mass of reactants)
What is the formula for the yield of a reaction?
100 x (Amount of specified product/theoretical maximum amount of product)
