Amount of Substance (3)
No description yet. This curated deck is ready for daily study.
Card preview (19)
mole
an amount of substance that contains 6.02x10^23 particles
avogadro’s constant
6.02x10^23
molar mass equation
amount (mol) = mass (g) / molar mass (g/mol)
molecular formulae
the amount of atoms of each elements in a molecule
empirical formula
the simplest whole number ratio of atoms of each element in a compound
relative molecular mass
the relative mass of a molecule compared to a carbon 12 atom
relative formula mass
the relative mass of a formula compared to a carbon 12 atom
concentration
amount / volume
molar gas volume at RTP (24dm3)
volume/amount
what is the ideal gas equation and what do the letters stand for?
pv=nrt p= pressure (pa) v= volume (m3) n= amount of moles r= 8.314 t= temperature ( K which is +273)
finding the relative molecular mass of gas
Measure the gas in a gas syringe to find the volume, then work out all the other constants for the ideal gas equation. Find the amount of moles and grams of the gas and work out the rfm.
stoichiometry
balancing equations to get a ratio of amount of moles.
percentage yield
actual mol / theoretical mol x100 actual is from amounts given in questions theoretical is from the equation
theoretical yield
the maximum amount of product that could be made
limiting reagent
the limiting reagent is the reactant that has the least moles and is used up first. This will mean that the moles is has is the maximum amount of moles of the products.
atom economy
a measure of how well the atoms have been used up and how sustainable they are. If there is no waste, your atom economy is 100%.
atom economy
mr of desired product / mr of all product
what are the conditions for an ideal gas?
. random motion . elastic collisions . negligable size . no intermolecular forces
why might theoretical yield not be possible?
. reaction might not go to completion . product might be lost . other reactions might occur on the side