mole concept Flashcards
what is the relative atomic mass?
average mass of one atoms of that element compared to 1/112 of the mass of one carbon-12 atom
what is the relative molecular mass?
average mass of one molecule of that substance compared to one twelfth of the mass of one atom of carbon-12 atom
how many particles are in a mole?
6 x 10^23 particles
what is avogadro’s constant/number?
6 x 10^23
what is the relationship between no. of moles and no. of particles?
no. of moles = no. of particles / 6x10^23
what is the si unit of no. of moles?
mol
what is the relationship between mass of substance, Mr and no. of moles?
mass of substance (g) = Mr x no. of moles
what is avogadro’s law?
equal volumes of all gases under the same temperature and pressure contain the same number of particles
what is the volume occupied by 1 mole of gas at room temperature and pressure?
24 dm^3 = 24000 cm^3
what is the relationship between volumes of gases and the number of moles of the gas?
the volume of gas is proportional to the number of moles of the gas
what is the relationship of the volume of gas, no. of moles and the molar volume?
volume of gas (dm^3) = no. of moles x 24 (dm^3)
what is the empirical formula?
simplest formula of a compound
what is the molecular formula?
the exact number of atoms in a compound
what is the limiting reactant?
completely used up in the reaction
what is the relationship of the volume of gas, no. of moles and the molar volume?
the volume of gas (dm^3) = no. of moles x 24 (dm^3)
what is the relationship between the mole concentration and no. of moles?
no, of moles (mol) = volume of solution (dm^3) x mole concentration (mol/dm^3)
what is the relationship between mole concentration and mass concentration?
mass concentration (g/dm^3) = Mr x mole concentration (mol/dm^3)
what is the relationship between mass concentration and mass of solute?
mass of solute (g) = mass concentration (g/dm^3) x volume of sol (dm^3)
how do you find percentage by mass of an element in a compound?
(Ar x no. of atoms of element/Mr of the compound) x 100 percentage
what is the formula for percentage purity?
(mass of pure substance /mass of given sample) x 100
how do you calculate percenatge yield?
(actual yield/expected yield) x 100
