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Lecture

# ch5 notes.docx

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School
Boston College
Department
Chemistry
Course
CHEM 1161
Professor
Schlegel
Semester
Fall

Description
Chemical Quantities and Reactions Thursday, September 20, 2012 11:27 AM 5.1 The Mole Avogadro's Number • Small particles such as atoms, molecules, and ions are counted using the mole. 1 mole = 6.02 x 10 items Avogadro’s number 23 602 000 000 000 000 000 000 000 = 6.02 x 10 Mole of Atoms 1 mole of an element = 6.02 x 1023 atoms of that element 1 mole of water = 6.02 x 1023 molecules H20 1 mole of sodium = 6.02 x 1023 atoms of sodium Avogadro's Number Avogadro’s number, 6.02 x 1023, can be written as an equality and as two conversion factors. Equality: 1 mole = 6.02 x 1023 particles Conversion Factors: 6.02 x 1023 particles ------------------------- 1 mole Moles of Elements in a Formula The subscripts in a formula show: • the relationship of atoms in the formula • the moles of each element in 1 mole of compound Aspirin C 9 8 4 1 molecule: 9 atoms of C 8 atoms of H 4 atoms of O 1 mole: 9 moles of C 8 moles of H 4 moles of O EX: How many atoms of O are in 0.150 mole of aspirin, C9H8O4? 0.150 mol C 9 8 4 mol O 6.02 x 10^23 1mole aspirin 1 mole O 5.2 Molar Mass The molar mass • is the mass of 1 mole of an element • is the atomic mass expressed in grams EX: Molar Mass of the Compound C2H6
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