Stoich Flashcards
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mole=
mass(g)/molar mass
moles to atoms
Grams-(molar mass) moles-(6.02x10^23) molecules-(chemical formula) atoms
empirical formula
the simplest form of formula
molecular formula
is a multiple of the empirical formula
to find molecular formula:
do mass of molecular formula/ molar mass= what number you get rounded to nearest whole number and add that to formula
percent by mass or percent composition
mass of part/molar mass x 100
How would you know if all the water was removed from the hydrate.
dyring to a constant mass
Limiting reactant
the reactant that determines the quantity of the product
Play dumb for limiting reactant what do you do
use stoich and put the mol of which ever eqaution under the stoic and solve for x
% yield =
experimental yield /theoretical Yield x 100
why do we care about % yield
low yields mean a loss of product
loq yields also increase the amount of waste, which needs to be disposed safely or reused.
mol of gas=
volume/ molar volume(stp)
how do you know when to use mol of gas
when the problem is telling you that you are at STP
combined gas law
p1v1/t1=p2v2/t2
what happens with the pressure and volume as tempeture remains constant(boyles Law)
pressure goes up, volume goes down
charlies Law
the greater the temperature the greater the volume
Pressure what unit should it be in
pressure must be in Pa
if Pressure is in kPa what do we do
multiply Kpa by 1000
what unit must volume be in
m^3
if voume is in dm cubed what must we do
we must divide volume by 1000
if volume in cm cubed what must we do
we must divide volume by 1,000,000
when to use P1V1/T1=P2V2/T2
when there is a initial and final
what is the number that goes with R in PV=NRT
r=8.31
optimum conditions for ideal gas
high temp low pressure
