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Topic 6: Stoichiometry

Stoichiometry is mass and quantity relationships among reactants and products in a chemical reaction. You can use stoichiometry to find how much a reaction can produce. You can use stoichiometry to answer these types of questions:

What is the mass in grams of N mols of the element X?

N mols. x atomic mass in grams of element X = _____ grams X  
1 mol. of element X

How many moles of X are in N grams of element X?

N grams x         1 mol of element X         = _____ mols. X  
Atomic mass in grams of X

How many moles of element X are in N atoms of element X?

N atoms x         1 mol X         = _____ atoms X  
6.022 x 1023 atoms

How many atoms of element X are in N mols. of element X?

N mols. X x 6.022 x 1023 atoms = _____ atoms X  
1 mol. X

What is the mass in grams of N atoms of element X?

N atoms x atomic mass in grams of element X = _____ grams X
6.022 x 1023 atoms

How many atoms of element X are in N grams of element X?

N grams X x       6.022 x 1023           = _____ atoms X
Atomic mass in grams of X

What mass of X2 contains the same number of atoms as N grams of element X1?

N grams X1 x    atomic mass in grams of element X2 = _____ grams X2
atomic mass in grams of element X1

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