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Molar Relationships

Dive into the fundamentals of molar relationships with a focus on calculation of molar mass. This guide explains the concept of a mole, Avogadro’s number, and how to determine the molar mass of various elements and compounds. Explore practical examples, including finding the mass of 1 mole of common substances like calcium carbonate and sodium chloride, as well as converting between moles, grams, and atoms. Perfect for students studying chemistry at any level, this material reinforces vital concepts through engaging practice problems.

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Molar Relationships

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  1. Molar Relationships

  2. Dozen = 12 Pair = 2 Names associated with an amount Can you think of any more?????

  3. The Mole….. The mole (mol) is the amount of a substance that contains as many elementary entities as there are atoms in exactly 12.00 grams of 12C 1 mol = NA = 6.0221367 x 1023 Avogadro’s number (NA)

  4. What is the mass of one mole of: S C Hg Cu Fe 3.2

  5. Molar Mass • The Mass of 1 mole (in grams) • Equal to the numerical value of the average atomic mass (get from periodic table) 1 mole of C atoms = 1 mole of Cu atoms = 1 mole of S atoms = 1mole of Hg atoms = 1 mole of Fe atoms =

  6. Learning Check! Find the molar mass (usually we round to the tenths place) = 79.9 g/mole • 1 mole of Br atoms • 1 mole of Sn atoms = 118.7 g/mole

  7. 1S 32.07 amu 2O + 2 x 16.00 amu SO2 SO2 64.07 amu Molecular mass (or molecular weight) is the sum of the atomic masses (in amu) in a molecule. For any molecule molecular mass (amu) = molar mass (grams) 1 molecule SO2 = 64.07 amu 1 mole SO2 = 64.07 g SO2 Let’s try some more…………….. 3.3

  8. Molar Mass of Molecules and Compounds Mass in grams of 1 mole equal numerically to the sum of the atomic masses 1 mole of CaCl2 = 111.1 g/mol 1 mole Ca x 40.1 g/mol + 2 moles Cl x 35.5 g/mol = 111.1 g/mol CaCl2 Practice with this one: 1 mole of N2O4=

  9. Learning Check! • Molar Mass of K2O = ? Grams/mole B. MolarMass of antacid Al(OH)3 = ? Grams/mole

  10. Learning Check Prozac, C17H18F3NO, is a widely used antidepressant that inhibits the uptake of serotonin by the brain. Find its molar mass.

  11. So, if one mole = the formula mass how do we calculate…. The mass of 05 mol of Calcium Carbonate The mass of 2.25 mol of Sodium Chloride

  12. How many moles are there in? 100 g of Magnesium Hydroxide ? 64 g of Oxygen ?

  13. Converting to # of atoms or molecules How many atoms are in 3.00 moles of Iron? How many atoms are in 0.25 moles of Water?

  14. Molar Mass The molar mass of a compound is found by adding Together the molar masses of all of its elements, taking Into account the number of moles of each element present. Homework: pg 157 # 5-11

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