Other Flashcards
For first ionization’s energy what is the value of n
n= Z
For 2nd, 3rd… ionization energies what is the value of n
n = coefficient of e-config after how ever many electrons have been removed
How many electrons do you remove for the first, second, third ionization’s
First = 1 e
Second = 2 e
Third = 3 e
Formula for percent yield
% yield = (actual yield/ theoretical yield) (100)
Wavelength formula
Lambda = c/v
How to solve if given wavelength and n, asked for element
1) given lambda, so E=hc/lambda
2) E = Z^2(Rh)/n , solve for Z and associate with an element
Steps for determining limiting reactant (2)
(If moles not given)
1) convert all masses to moles (if moles not given)
2) divide each mole value by their corresponding coefficient
smaller #= limiting reactant
What does “what mass of the product CAN BE FORMED mean”
you have to determine the limiting reactant BEFORE you can do stoich calculations
How to solve “what mass of the product can be formed questions” (2)
1) determine limiting reactant
2) use stoich formula to determine number of miles of product formed, but replace initial reactant with limiting reactant
(moles of limiting reactant)(coeff of column wanted)/ (coeff of limiting reactant)
Formula for n
n = m/M
Stoich formula (in moles)
(Initial of first reactant)(coeff of column wanted)/ (coeff of first column)
How to calculate percent dissociation for acids when given ph
Raise 10 to the negative power of the pH for the value of the “amount dissociated”
(Amount dissociated)/(original amount in moles) (100)
What does for in chemical formula mean
Multiply molar mass of that compound by that coefficient
Steps for finding unknown coeff of multiplication formula (4)
1) find total M of compound
2) subtract all M’s from elements WITHOUT unknown coeff
3) determine total M of elements with UNKOWN coeff
4) divide number in step 2 by number in step 3 to obtain coeff
Formula for vapour pressure
Vapour pressure =
(mol frac of solvent)(vapour press of solvent)
