1.2 Mole Conversions Solutions
PRACTICE EXAMPLES- To complete the practice examples (1) write the type of question you have, (2) write
the equation with units, (3) show the cancellation of units and (4) calculate the solution.
1. Determine how many atoms are present in 2.5 moles of Silicon? (15.05 × 1023 atoms)
MOLES ATOMS
mole
atomsmoles
_1
10022.6
1
_5.2 23
= 15.05 x 1023 atoms
2. How many moles of Silicon is 3.01 × 1023 atoms? (.5 moles)
ATOMS MOLES
atom
moleatoms
23
23
10022.6
_1
1
10011.3
= .5 moles
3. What is the mass of 4 moles of Iron? (224 grams)
MOLES GRAMS
mole
gramsmoles _9.55
1
_4
224 grams of C
4. How many atoms are in 48.6 grams of Magnesium? (12.04 × 1023 atoms)
GRAMS ATOMS
mole
atoms
grams
molegrams
_1
10022.6
_3.24
_1
1
_6.48 23
12.04 x 1023 atoms
5. How many grams are in 18 .06 x 1023atoms of Copper? (190.5 grams)
ATOMS GRAMS
mole
grams
atoms
moleatoms
_1
_5.63
10022.6
_1
1
1006.18
23
23
190.5 grams
6. How many moles of Nickel is 176 grams? (3 moles)
GRAMS MOLES
grams
moleCofgrams
_7.581
___176
3 moles
