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Chapter 4a notes

# Chapter 4a notes - CHM 1025 Chapter 4 1 The Mole a Relative...

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Chapter 4 Toyota 1 CHM 1025 Chapter 4 1. The Mole a. Relative atomic mass units are used to compare masses of elements; not useful for ______________. b. We can’t weigh single atoms: i. C atom weighs ___________ g ii. Fe atom weighs ___________ g iii. The solution is to use a unit called the mole (mol). 1. A mole contains 6.022 x 10 23 atoms, molecules, ions, or formula unit a. This number is also called Avogadro’s number 2. How many silver atoms are there in a mole of silver? ____________________ 3. How many molecules are there in a mole of oxygen? ____________________ 4. How many cats are there in a mole of cats? ____________________ 5. How many N 2 O 5 molecules are there in 2 mol? a. How many N atoms? iv. Mole of 12 C has a mass of exactly 12 g 1. Convenient because 12 amu can be easily converted to 12 g in a mol of 12 C. c. Molar Mass is the mass of 1 mol of the substance and is numerically the same as the relative atomic mass units. i. You may see molar mass written many ways: atomic mass, formula weight, molecular weight, formula mass, atomic weight. . . d. Mass to moles i. We saw above that a mole of chlorine molecules has a mass of 70.9 g. How many moles are there in 35.5 g of Cl 2 ?

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