1. Selected Answers to Mole Conversions Worksheet
Unit 3: Chemical Reactions

2. Unit 3: Chemical Reactions
#9 A) How many moles in 124.8g Ni?
Look at mole wheel to see # of steps
Start with Given Amount
This problem goes from Mass to Moles…..
Round to proper Sig Figs
So it is just a one-step problem
Calculate Answer 1
molNi
124.8gNi
= g
= g
58.69
gNi
Use relationships to plug in proper #’s
1 Mole of Nickel = 58.69g (from Pd Table)
Fill in proper units
“No Brainer” Step is that grams go on the bottom
We are going to moles, so they go on top.
Unit 3: Chemical Reactions

3. Unit 3: Chemical Reactions
#11 A) How many atoms in 65.2g Hg?
Look at mole wheel to see # of steps
Start with Given Amount
This problem goes from Mass to How Many…
And Round to proper Sig Figs
So it is a 2-step problem
Calculate Answer 1
molHg
6.02 x 1023
atomsHg
65.2gHg
= x1023atoms
200.59
gHg 1
molHg
Use relationships to plug in proper #’s
1 Mole of Mercury = g (from Pd Table)
Fill in proper units
1 Mole of Atoms = 6.02 x 1023 atoms
“No Brainer” Step is that grams go on the bottom
We need to go to moles first, so they go on top.
Then we go from Moles to the Number of Atoms
Unit 3: Chemical Reactions