chemistry equations Flashcards
(28 cards)
equation for relative isotopic mass
isotope 1/ (abundance 1 divided by ab1+ab2) + isotope 2 / (abundance 2 divided by 1ab1+ab2)
is the total always 100%
no so make sure u add up ab1 and ab2 etc
mass=?
mr X mol
how do u find empirical formula
find the ratio of elements as they are (molecular formula) then divide it so it gets to simplest whole number ratio
what is avogadros constant
6.02 x 10^23
how to find concentration of solute
mass of solute/ total volume of solution
how to do water of crystallisation
1) find mr of the product
2)find the ratio of the product to the water remembering mr of water is 18
24 moles =?
volume of gas at standard temp and pressure
pv=NRT
Pa x m3 = moles x 8.314 x K
n=?
vc
percentage yield
actual / theoretical x 100
atomic economy
mr of useful / all mr
what is the calorimitery equation
q=mc delta T
what does each letter stand for
q= energy change
m= mass
c= specific heat capacity
delta T= temp change
equation for enthalpy
q/1000 n of limiting reactant
equation for enthalpy change
total bond enthalpies of reactants - total bond enthalpy of products
equation for equilibrium constant Kc
conc of products timsed by each other/ conc of reactants timsed by each other. also each is to the power of their molar ratio
how do u find partial pressure
= total pressure times mole fraction.
ie if it was 240Pa and 1/3 then it would be 80Pa
how do you find mole fraction (of A)
moles of A / total moles of all gases
equilibrium constant Kp
partial pressure of products timsed by each other divided by partial pressure of reactants timsed by each other
ARRENHEIUS TO DO
rate equation
k = conc of reactants timsed by each other and they are each to the power of their orders
what is k
rate constant
units of concentration of reaction
moldm-3
