Quantitative Chemistry Flashcards
what is the equation for number of moles
mass (g)/ relative formula mass
number of atoms or molecules
moles x 6.02 x 10^23
what is avogadros constant
6.02 x 10^23 atoms in one mole
mass of one atom
mass of one mole/ avogadros constant
what is uncertainty
a doubt with measurement when we use a piece of apparatus to make a measurement
how is uncertainty written
±
uncertainty calculation
uncertainty = range /2
what is a limiting reactant
when one reactant is in excess, the other reactant is a limiting reactant
what does the limiting reactant decide
how much product is made
what is the yield
how much product we make in a chemical reaction
why don’t we always get 100% yield
some reactions do not finish, reversible and can turn back into reactants
some of product may be lost when it is separated from the reaction mixture
some reactants may react in a different way- take part in other reactions
some of the reactants may be impure
what is the percentage yield equation
percentage yield = (mass of actual product/ maximum theoretical mass of product ) x 100
how many dm is one mole of gas
occupies 24dm^3 at room temperature(20 degrees) and pressure (1 atmosphere)
what is the volume of gas equation
volume of gas = moles x 24
what is the units of gas
dm^3
