Chapter 10: Chemical Quantities (Topic pre-viewed in lab)
Activities
•In-class workshops calculation of molar mass (gram-formula mass)
•Open-notes evaluations
•Quizes and tests
•Homework
•Lab activitiesMole ratios lab – Qualitative Lab 5
Mole labs – Quantitative Labs 6 , 8, 9
Na2CO3 + CaCl2 yields CaCO3 and 2 NaCl
NaHCO3 and HCl yields CO2 + H2O + NaCl
Percent composition of water in a hydrate
The mole: A measurement of matter
TB section 10.1
Mole-Mass and Mole-Volume relationships:
TB section 10.2
Percent Composition and Chemical Formula
TB section10.3
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The Mole: A Measurement of Matter
> What is a Mole?
Converting Number of Particles to Moles
One mole (mol) of a substance is 6.02 1023 representative particles of that substance and is the SI unit for measuring the amount of a substance. The term representative particle refers to the species present in a substance: usually atoms, molecules, or formula units.
The number of representative particles in a mole, 6.02 1023, is called Avogadro’s number.
10.1
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The Mole: A Measurement of Matter
> What is a Mole?10.1
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The Mole: A Measurement of Matter
> What is a Mole?
Converting Moles to Number of Particles
10.1
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10.3
Read the question CAREFULLY. What do you need to find?
Hints:
(1)How many molecules of propane are in one mole of propane?
(2)How many atoms are there in one molecule of propane?
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The Mole: A Measurement of Matter
>
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The Mass of a Mole of an Element
The Mass of a Mole of an Element (use Periodic Table)
How is the atomic mass of an element related to the molar mass of an element?
The atomic mass of an element expressed in grams is the mass of a mole of the element. The mass of a mole of an element is its molar mass (gram-formula mass).
10.1
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The Mole: A Measurement of Matter
> The Mass of a Mole of an Element
One molar mass of carbon, sulfur, mercury, and iron are shown.
10.1
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The Mole: A Measurement of Matter
>
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The Mass of a Mole of a Compound
The Mass of a Mole of a Compound
How is the mass of a mole of a compound calculated?
To calculate the molar mass of a compound, find the number of grams of each element in one mole of the compound. Then add the masses of the elements in the compound.
10.1
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The Mole: A Measurement of Matter
> The Mass of a Mole of a Compound
One SO3 molecule has a mass of 80.1 amu. Substitute the unit grams for atomic mass units. Thus 1 mol of SO3 has a mass of 80.1 g. One mole of SO3 molecules has a mass of 80.1 grams
10.1
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The Mole: A Measurement of Matter
> The Mass of a Mole of a Compound
Molar Masses of Glucose, Water, and Paradichlorobenzene
10.1
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Section Quiz
-or-Continue to: Launch:
Assess students’ understanding of the concepts in Section
10.1 Section Quiz.
10.1.
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10.1 Section Quiz.
2. A mole of hydrogen gas, H2(g), contains 6.02 x 1023
a. molecules.
b. atoms.
c. amu.
d. grams.
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10.1 Section Quiz.
3. The atomic mass of fluorine is 19.0 amu, so the molar mass is
a. 19.0 amu.
b. 19.0 g.
c. 6.02 x 1023 amu.
d. 6.02 x 1023 g.