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Chemistry 11 Mr. Warren
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What is Molar Mass? The mass of one mole of a substance
Symbol: M Units: g/mol “or” g∙mol-1 One mole of an element has a mass expressed in grams that is numerically equivalent to the element’s average atomic mass. Element AAM (amu) Molar Mass (g/mol) Boron 10.81 Gold 196.97
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Finding Molar Mass of HCl
Ex. 1: HCl Count # of moles 1 mol of HCl contains 1 mol H and 1 mol Cl
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Finding Molar Mass of C6H12O6
Ex. 2: C6H12O6
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Questions? Practice Page 56 Question’s 16, 17, 18 & 19
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Chemistry 11 Mr. Warren
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Mass = (# moles)(molar mass)
m = n M
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Ex. A beaker has 0.685 mol of K2S. What mass of K2S is in the sample?
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Try: What mass is 4.3 moles of copper(II) sulfate?
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From mass to moles Ex. How many moles of methanol, CH3OH, are in a 21.8g of sample? Find the molar mass Solve for moles
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Solving for # of moles when given the mass of a substance?
Homework Questions Solving for # of moles when given the mass of a substance?
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Answers to Homework Questions
n = mol n = mol n = mol
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Question? If H2O is water, what is H2O4?
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Washing, Bathing, Drinking, Swimming.
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Chemistry 11 Mr. Warren
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Recall We can find moles of a substance when we know the number of particles it contains and by dividing it by Avogadro’s Number. n = N NA
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2.44 x 1024 atoms of Cu How many moles of copper?
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Moles, Mass and # of particles conversions
(atoms, ions, molecules, formula units Avogadro’s Constant Molar Mass [g/mol] Moles [mol] Mass [g]
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Scenario 1: Particles to Mass
STEPS???
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Example: What is the mass of 2.74 x 1024 formula units of CrPO4?
Find the number of moles using Avogadro’s constant:
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Example: What is the mass of 2.74 x 1024 formula units of CrPO4?
Find the number of moles using Avogadro’s constant: mol Find the molar mass of CrPO4:
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Example: What is the mass of 2.74 x 1024 formula units of CrPO4?
Find the number of moles using Avogadro’s constant: mol Find the molar mass of CrPO4: g/mol Solve for mass:
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Try: Vitamin B, C17H20N4O6 , is also called riboflavin
Try: Vitamin B, C17H20N4O6 , is also called riboflavin. What is the mass of a sample consisting of 7.36 x 1022 molecules of riboflavin?
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Scenario 2: Mass to Particles
STEPS???
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Example: How many molecules of bromine chloride, BrCl, are contained in a 2.66 x 10-1 g sample?
1) Find the molar mass:
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Example: How many molecules of bromine chloride, BrCl, are contained in a 2.66 x 10-1 g sample?
1) Find the molar mass: g/mol 2) Find the number of moles:
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Example: How many molecules of bromine chloride, BrCl, are contained in a 2.66 x 10-1 g sample?
1) Find the molar mass: g/mol 2) Find the number of moles: x 10-3 mol 3) Find the number of molecules:
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Try: The artificial sweetener aspartame (Nutra-Sweet) formula C14H18N2O5 is used to sweeten diet foods, coffee and soft drinks. How many molecules of aspartame are present in 225 g of aspartame?
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Practice Page 63 of textbook Question’s 28, 29 & 30 Footer Text
9/21/2018
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