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UNIT 3 MOLE CONCEPT

UNIT 3 MOLE CONCEPT. INTRODUCTION. RAMAN GILLIAN CHRISTIAN KANDOLA GATUS SANTOS. The mole concept is a method that determines the mass or weight used when dealing with large quantities of atoms. CONTENTS R elative M ass A tomic M ass T he M ole M olar M ass.

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UNIT 3 MOLE CONCEPT

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  1. UNIT 3 MOLE CONCEPT INTRODUCTION RAMAN GILLIAN CHRISTIAN KANDOLA GATUS SANTOS

  2. The mole concept is a method that determines the mass or weight used when dealing with large quantities of atoms CONTENTS Relative Mass Atomic Mass The Mole Molar Mass

  3. RELATIVE MASS Any object’s mass that is expressed by comparing it mathematically to another object’s mass The comparison of atoms with equal numbered masses without knowing the mass of a single atom

  4. ATOMIC MASS Mass of an atom Atomic mass of a substance is found by comparing its mass to an atom that is taken as standard The standard atom has changed over time. At first it was hydrogen, then oxygen and now it is carbon The changes were made in order to make the measurements more precise Atomic Mass Unit (u): a unit of relative measurement assigned to the masses of individual atoms 1/12 the mass of a carbon-12 atom The atomic mass on the periodic table is based on the carbon standard

  5. (MOL)E The amount of a substance that contains 6.02 x 10²³ particles Used to talk about a number of atoms, molecules, ions, and electrons 1 mole of a substance’s atom has a mass that is equal to the atomic mass of a single atom of the substance

  6. Mole Road Map This diagram is a creative way to describe mole relationships.

  7. QUANTITIES OF A MOLE The mole concept is a method that determines the mass or weight used when dealing with large quantities of atoms In the case of atoms, the number of grams necessary to have one mole is the same as the atomic mass of that particular atom The number of atoms in each mole is the same, but the mass differs

  8. Example 4-4 If a steel cylinder contains 3.01 x 1023carbon dioxide molecules, how many moles of oxygen atoms are in the steel cylinder? 2 oxygen atoms in each CO2molecule 3.01 x 1023 CO2molecules x 2 oxygen atoms x 1 mol oxygen atoms 1 CO2 molecule 6.02 x 1023 oxygen atoms = 1.00 mol oxygen atoms

  9. Example 4-5 How many carbon dioxide molecules are in .75 mol of CO2 ? Unitary rate in molecules per mole of CO2 is 6.02 x 1023 molecules mol .75 mol CO2 x 6.02 x 1023 CO2 molecules mol = 4.5 x 1023 CO2 molecules

  10. Example 4-7 How many moles of carbon are in 26g of carbon? The mass of a mole of carbon atoms is the atomic mass in grams on the periodic table: 1 mol of carbon corresponds to 12.0 g of carbon 26g Carbon x 1 mol Carbon 12.0g Carbon = 2.2 mol Carbon

  11. Example 4-8 How many oxygen atoms are in 0.75 mol CO2? 1 CO2molecule has 2 oxygen atoms 1 mol oxygen atoms corresponds to 6.02 x 1023oxygen atoms 0.75 mol CO2 x 6.02 x 1023 CO2 molecules x 2 oxygen atoms mol CO2 CO2 molecule =9.0 x 1023 oxygen atoms

  12. Example 4-9 What is the mass of one atom of aluminum? The mass of a mole of aluminum atoms is the atomic mass listed on periodic table: 26.98g corresponds to 6.02 x 1023atoms 26.98 g 6.02 x 1023 atoms = 4.48 x 10-23 g/atom

  13. (MOL)AR MASS Is the mass of one mole of atoms, ions, molecules, or formula units Formula units is the simplest formula that provides the smallest wholenumber ratio of ions in a compound For a compound the mass is found by adding the atomic masses of all the elements in a compound

  14. Example 4-10 What is the molar mass of sucrose, C12H22O11? Atomic Mass Number of Atoms Mass Carbon 12.0 x 12 = 144 Hydrogen 1.01 x 22 = 22.2 Oxygen 16.0 x 11 = 176 Add the masses 144 + 22.2 + 176 = 342 g

  15. Example 4-11 What is the molar mass of aluminum sulphate, Al2(SO4)3 ? 2 mol of Al atoms each with molar mass = 27.0 g 3 mol of S atoms each with molar mass = 32.1 g 12 mol of O atoms each with molar mass = 16.0 g 2(27.0g) + 3(32.1g) + 12(16.0g)= 342.3 g

  16. The END

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