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The MOLE CH 11

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**Mole (mol) SI base unit used to measure the amount of a substance**

One (1) mole of anything is 6.02 X 1023 Compare to other counting units: Pair = 2 Dozen = 12 Gross = 144 Ream = 500 Mole = 6.02 X 1023

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**Math Practice How many gloves are there in 8 prs?**

How many roses in 2.5 doz? How many atoms in 0.5 mol?

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Avogadro’s Number is 6.02 X 1023 Amedeo Avogadro determined the volume of one mol of gas

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**Molar Mass The mass in grams of one mole of any pure substance**

Numerically equal to its atomic mass (amu) but, has the units g/mol Example: An atom of manganese has a mass of amu A molar mass = 1 mol of manganese 54.94 g of Mn contains 6.02 X 1023 atoms of Mn

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**Molar Mass Ionic Compounds Use the formula mass Example:**

Sodium Chloride A mole of sodium has mass = g A mole of chloride ions has mass = g One mole of NaCl = g Or, the molar mass of NaCl is g/mol

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**What is the molar mass of potassium nitrate?**

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**Molar Mass Of a metal Use the atomic mass converted to g/mol Example:**

Iron A mole of iron has mass = g One mole of Fe = g Or, the molar mass of iron is g/mol

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Practice What mass of aluminum foil will contain an Avogadro’s number of Al atoms? An experiment calls for mol of Al. How much should be weighed out?

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**Molar Mass of Nonmetallic Elements**

Use the mass of 6.02 X 1023 molecules What is the molar mass of: A. hydrogen B. nitrogen C. oxygen

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**Molar Mass of Molecules**

What is the molar mass of water? A mol of water molecules contains _____ mol of H atoms _____ mol of O atoms The molar mass of water is ______________

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**Calculations with Moles**

a. Counting mol if given the mass Ex. How many moles of calcium are there in a 16.0 g sample? Track Method: =

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**Calculations with Moles**

a. Counting mol if given the mass Ex. How many moles of calcium are there in a 16.0 g sample? Track Method: 16.0 g Ca = mol

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**Calculations with Moles**

a. Counting mol if given the mass Ex. How many moles of calcium are there in a 16.0 g sample? Track Method: 16.0 g Ca mol Ca 40.1 g Ca = mol

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**Calculations with Moles**

a. Counting mol if given the mass Ex. How many moles of calcium are there in a 16.0 g sample? Track Method: 16.0 g Ca mol Ca 40.1 g Ca = mol

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**Calculations with Moles**

b. Relating mass to number of particles Ex. What is the mass of 2.50 X 1021 calcium atoms? Track Method: 2.50 X 1021 atoms = g Ca

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**Calculations with Moles**

b. Relating mass to number of particles Ex. What is the mass of 2.50 X 1021 calcium atoms? Track Method: 2.50 X 1021 atoms g Ca 6.02 X 1023 atoms = g Ca

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**Calculations with Moles**

b. Relating mass to number of particles Ex. What is the mass of 2.50 X 1021 calcium atoms? Track Method: 2.50 X 1021 atoms g Ca 6.02 X 1023 atoms = g Ca

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