IN CASE YOU ARE NOT CONSIDERING:
During our review days I forget to point out that you need
to study the “mole road” please revise it.
mass  # mole  # particles
mass to # mole divide by MM & # mole to mass multiply by
MM
MM is molar mass & it is the sum of atomic masses
We get atomic mass from periodic table. The unit of MM is
g/mole. If it is an element its molar mass is the same as its
atomic mass. For diatomic elements (H,N,O,F,Cl,Br & I )
their molar mass is double of their atomic mass (if they
are in their natural state).
# mole to # particle multiply by Avog.# &
#particle to # mole divide by Avog. #
Avog. # is 6.02*1023
The other important point is Limiting Reactants (LR) : If
the mass or # moles of two reactants is given do not forget
first to figure out the LR by comparing the # moles for the
given mass with the mole ratio from balanced equation,
Once you know the LR use that amount to find the
theoretical yield and other related question. (Please revise
stoichiometric calculations).
Also remember the Hf & Gf for elements in their natural
state is zero. Hf is Heat of formation.
STUDY significant # in calculations & chemical equilibrium
GOOD LUCK