Textbook Notes (368,125)
United States (205,946)
Chemistry (65)
Chapter 3

CHEM UA 125- Chapter 3 Notes

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John Halpin

stoichiometry the study of the quantitative aspects of formulas and reactions31moles allow us to count chemical entities by weighing themmole the SI unit for amount of substancethe amount of a substance that contains the same number of entities as the number of atoms in 12g of carbon12Avogadros number 6022x1023tells the number and the mass of a substanceatomic mass units of one atom of an element is the same numerically as the mass in grams of one mole of atoms of the elementmolar mass the mass per mole of its entities gmolelements make sure if monatomic or diatomicmolecular elements use formula to determine molar masscompounds sum of the molar masses of the atoms in the formulaamountmassmass gamount mol x gramsmolmassamountamount molmass g x molgramsamountnumbernumberamount mol x 6022x1023molnumberamountamount molnumber6022x1023mass percent moles of x in formulamolar mass of Xmass of 1 mol of compound 100mass of element mass of compound x mass of element in 1 mol of compoundmass of 1 mol of compound32empirical formula
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