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Mole Problems
Molecular Mass / Formula Mass
1) Find the formula mass of KMnO4.
2) Find the formula mass of Mg3(PO4)2.
3) Find the molecular mass of C12H22O11.
Conversion of Moles, Grams, Molecules, and Atoms
1) How many moles are in 17.7 g of KMnO4?
How many formula units are in 17.7 g KMnO4?
How many atoms of O are in 17.7 g KMnO4?
2) How many moles are in 41.2 g of Mg3(PO4)2?
How many formula units are in 41.2 g Mg3(PO4)2?
How many atoms of P are in 41.2 g Mg3(PO4)2?
3) How many moles are in 26.9 g of C12H22O11?
How many molecules are in 26.9 g of C12H22O11?
How many atoms of C are in 26.9 g of C12H22O11?
4) How many moles are 19.8 x 1024 molecules C12H22O11?
What is the mass of 19.8 x 1024
molecules C12H22O11?
5) How many moles of Mg3(PO4)2 are
27.6 x 1037 atoms of O in Mg3(PO4)2?
6) How many moles of KMnO4 are 3.64 x 1025 atoms of Mn
in KMnO4?
Percent Composition
1) Find the percentage composition of KMnO4.
2) Find the percentage composition of Mg3(PO4)2.
3) Find the percentage composition of C12H22O11.
Empirical Formula
1) What is the empirical formula for a compound if a 83.7 g sample contains
44.28g Al
and 39.42 g O?
2) What is the empirical formula for a compound if a 55.0 g sample contains
22.0 g C, 3.67 g H, and 29.33 g O?
Molecular Formula
1) A compound has a percentage composition of 40.01% C, 6.69 % H,
and 53.30% O. Its
molecular mass is 179.9 amu. What is it's
empirical formula? What is it's molecular formula?
2) A compound has a percentage composition of 46.68% N and
53.32% O. Its molecular
mass is 59.98 amu. What is the empirical
formula? What is it's molecular formula?
Hydrates
1) A 16.59 g sample of hydrated sodium thiosulfate. The sample is
heated to drive off the
water. The dry sample has a mass of 10.59 g of sodium
thiosulfate. What is the formula for
the hydrate?
2) A 35.64 g sample of hydrated barium bromide. The sample is
heated to drive off the water.
The dry sample has a mass of 30.42 g of barium
bromide. What is the formula for the
hydrate?
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