Mole Calculation Worksheet
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Mole to Grams, Grams to Moles Conversions Worksheet
What are the molecular weights of the following compounds? (all masses must be to nearest hundredth)
1)
NaOH
2)
H
PO
3
4
3)
H
O
4)
Mn
Se
2
2
7
5)
MgCl
6)
(NH
)
SO
2
4
2
4
There are three definitions (equalities) of mole. They are:
23
1 mole = 6.02 x 10
particles
1 mole = molar mass (could be atomic mass from periodic table or molecular mass)
1 mole = 22.4 L of a gas at STP (You do not need to worry about this yet)
Each definition can be written as a set of two conversion factors. They are:
1 mole = molar mass(g) can be written as
____1 mole
OR
_molar mass (g)
molar mass (g)
1 mole
23
23
1 mole = 6.02 x 10
particles can be written as
____1 mole
OR
__6.02 x 10
_
23
6.02 x 10
1 mole
Solve the following:
1)
How many moles are in 15 grams of lithium?
(molar mass of lithium is 6.94 g/mole)
2.2 moles Li
15 grams x
1 mole
=
2.1614 moles lithium =
6.94grams
2)
How many grams are in 2.4 moles of sulfur?
(molar mass of sulfur is 32.07 g/ mole)
77 g Sulfur
2.4 moles x 32.07 grams
=
76.97 grams sulfur =
1 mole
3)
How many moles are in 22 grams of argon?
4)
How many grams are in 88.1 moles of magnesium?
5)
How many moles are in 2.3 grams of phosphorus?
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