CHM135H1 Chapter Notes - Chapter 3: Molar Mass, Unified Atomic Mass Unit
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CHM135H1 Full Course Notes
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Chapter 3 (mol) mole: a devised unit to count chemical entities by weighing them. Amt of sub that has same # of entities as # of atoms in 12g of c12. The # of objects in a given mass. 1 mole of c12 has 6. 022x1023 c12 atoms + mass of 12g. Mole of c12 has 3. 011x1023 atoms + mass of 6g. In elements, mass in amu of one atom of an element = mass (g) of 1 mole of atoms of element. Ex) 1 atom of s has a mass 32. 07amu, 1 mole of s has mass 32. 07g. In compounds, mass in amu of molecule = mass (g) of 1 mole of compound. Ex) h2o =18. 02: mole relates # of entities to mass of entities, same # of mass(amu) + mass (g) # for atomic mass = molar mass. For compounds: look @ subscripts, multiply by atomic mass, add sum.
