Chapter 6 pt. 1 - Lecture notes 16 PDF

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Chapter 6 pt. 1 Notes...

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Chapter 6 Stoichiometry Of chemical reactions pt. 1 Mole in Chemistry ● Number ● 602 000 000 000 000 000 000 000 ● 602 hexillion How Big is Avagadros #? ● A mole of marbles would cover the entire planet earth with a thickness of 50 mile ● 602 000 000 000 000 000 000 000 ● 602 hexillion eggs = 1 mole eggs ● 1 mole of NaCl= 602 hexillion molecules of NaCl 1 Mole = Avagadros # ● Determined such that the numerical value of the atomic mass of an element in amu is equal to the molar mass of that element in grams per mole. ● These relationships of grams, moles, and atoms can be used as conversion factors. The Mole Concept ● Counting particles as small as atoms is impractical ● The mole concept allows us to relate the mass of a sample of an element to the number of atoms it contains ● The unit of comparison is called a mole and corresponds to 6.022 ×1023 Active Exercise ● You are carrying out a laboratory reaction that requires 0.0360 mole of barium chloride ● How many grams of compound do you measure out? - Solution: ➔ Given: 0.0360 mole of barium chloride ➔ Wanted: Grams ➔ BaCl2: 137.3 g/mol ➔ 35.4 5 g/mol ➔ 35.4 5 g/mol ➔ 208.2 0 g/mol ➔ 0.0360 mol ➔ BaCl2 ×= 7.50 g BaCl2...