vs Gram Formula Mass AMUs vs Grams Aim How can we find the formula mass and gram formula mass of a compound Essential Questions How can we find the formula mass and gram formula mass of a compound ID: 298139
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Slide1
Formula Mass vs. Gram Formula Mass
AMUs
vs
GramsSlide2
Aim: How can we find the
formula mass
and gram formula mass of a compound?
Essential Questions:How can we find the formula mass and gram formula mass of a compound?
Key Words: mole, Atomic Mass Unit (AMU), formula mass, gram formula mass, empirical formula, molecular formula
What is the difference between empirical and molecular formulas.
What is the purpose of finding the gram formula mass of a compound? Explain.Slide3
Smallest Unit of a Compound?
If I have a beaker of water, what is the smallest unit of that substance?
H2
OThe formula of water is the smallest unit of water. Slide4
Formula Mass
If the formula is the smallest unit of a substance, how do we calculate the formula mass of a substance?
We take the sum of the atomic masses of that substance.
Let’s find the formula mass for:Al: _____O2
: _____Sodium Sulfate: _____Slide5
How do we find the atomic mass of Sodium Sulfate?
Step 1 : Write the correct formula!Slide6
Na2SO4
Element
Atomic Mass
# of Atoms (Subscript)
Total
x
=
x
=
x
=
Formula Mass:
Always Expressed in AMU!Slide7
Picture This!
You are a chemical technician.
A chemist asks you for 1 AMU of Na2
SO4 How will you give it to him? What will you do?Slide8
Convert to Grams
Gram Formula Mass!Slide9
Find the Gram Formula Mass for Glucose
Element
Atomic Mass
# of Atoms (Subscript)
Total
x
=
x
=
x
=Slide10
Find the Gram Formula Mass of Zirconium Phosphate
Element
Atomic Mass
# of Atoms (Subscript)
Total
x
=
x
=
x
=Slide11
HWFind the gram formula mass for the sheet from (1) KMuO
4
to (11) H2CO3Slide12
(Notes)
Formula Mass
The Formula of a substance is the smallest unit of that substance.
Calculating the Formula Mass of a substanceStep 1: Find the correct formulaStep 2: Find the gram atomic masses of each element (see periodic table and round off number to the nearest tenth)
.Step 3: Multiply each atomic mass by the subscript in the formula.Step 4: Find the sum of the masses.Slide13
(Notes)
Use the following chart to avoid
errors
The formula mass is always expressed in AMU’sSlide14
(Notes)II. Gram Formula Mass
Convert formula mass to grams and you will have the gram formula mass.