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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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 moleculesWho can explain this?
This Explains the simple volume ratio for gases
The mass of one mole of “C” atoms is 12.0g
The mass of one mole of “Ca” atoms is 40.1gAtomic Mass
= 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