N = the number of particles
NA = 6.02*10^23 particles/mol
n = moles
N = n * NA
mass / molar mass = mol
n = N /NA
percent composion of s = mass of s / mass of compund *100
Identifying limiting reactant :
1) masses to moles
2)use mole ration
3) limiting reactant is the one that is with the smallest num
1)Divide given yeild by the limiting reactant
2) multiply by 100
Finding the Formula of a Hydrate:
1. Find the # of g of MN and # of g of H 2 O.
2. Convert g to mol.
3. Divide each “# of mol” by the smallest “# of mol.”
4. Use the ratio to find the hydrate’s formula.
Mass percent of water in Ba(OH)2 . XH2O
= (Total mass of sample) - (Mass of Ba(OH)2 in sample) / (Total mass of sample) * 100
molar mass molecular mass /molar mass empirical formula then multiply by formula