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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.

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