SME
Grade 10 Science · Problem type
Grams to moles with a unit factor
Use this for “How many moles are in 22 g of CO₂ (44.01 g/mol)?”
Table
Mass (m)
(g)
Amount (n)
(mol)
This is an example. Type your own values to start a new problem.
m
g
×
1
mol
g
=
n
mol
Formulas
n
=
m
M
0.5
=
22
44.01
Assumptions
•
The molar mass M is the mass of 1 mol, in grams.
•
1 mol/M g is a unit factor: the grams cancel, leaving moles.
Step-by-step
WE KNOW
m = 22 g, M = 44.01 g/mol
FIND
amount (n)
Step 1 · Find amount (n)
Use n = m ÷ M
Multiply
by
1
mol
over
M
grams:
the
grams
cancel.
n
=
22
44.01
22 g × 1 mol/44.01 g: the grams cancel, leaving mol
n
=
0.5
mol
Check
Put the numbers back in. Both sides should match.
0.5
≈
22
44.01
✓
Topic check
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