Moles a militros
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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
Percent yield:
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
Ba(OH)2
molar mass molecular mass /molar mass empirical formula then multiply by formula