Unit V: The Mole Concept. 5.1-5.2 – Atomic Mass, Avogrados Hypothesis, and the Mole (pg. 77-85, Hebden ). Today’s Objectives. Explain the significance of the mole, including: Recognize the significance of relative atomic mass, with reference to the periodic table
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Unit V: The Mole Concept
5.1-5.2 – Atomic Mass, Avogrados Hypothesis, and the Mole
(pg. 77-85, Hebden)
Do exercises 2-5 on p. 78
Equal volumes of any gas at standard temperature and pressure contain the same number of molecules
This Explains the simple volume ratio for gases
The mass of 1 mole of atoms of an element.
The mass of one mole of “C” atoms is 12.0g
The mass of one mole of “Ca” atoms is 40.1g
= 2(1.0) + 16.0 = 18.0 g/mol
= 40.1 + 2(14.0) + 6(16.0)
= 3(14.0) +12(1.0) + 31.0 + 4(16.0)
= 149.0 g/mol
HMWK: p80 #6-7